Phillip Metzger

Biography

Dr. Metzger received his B.S.E. in electrical engineering from Auburn University and a PhD in Physics from UCF. He has been research faculty at UCF since 2016 and is currently the director of the Stephen W. Hawking Center for Microgravity Research and Education.

Highlights

While at NASA he led the Agency’s work in rocket blast effects for human-class missions. He participated in architecture studies for the Lunar Architecture Team, the Mars Architecture Team and the Lunar Exploration Analysis Group, and he helped develop NASA’s technology roadmap for planetary surface technologies. He has also led projects to develop extraterrestrial excavators, regolith conveyance technologies, dust-tolerant quick disconnects, lunar/martian landing pads, and other surface systems technology. He co-founded NASA’s biannual Workshop on Granular Materials in Lunar and Martian Exploration and is a founding member of the ASCE Technical Committee for Regolith Operations, Mobility and Robotics. He was selected as Kennedy Space Center NASA Scientist/Engineer of the Year for 2011. He received the astronaut’s Silver Snoopy award in 2011 and NASA’s Silver Achievement Medal in 2014. He was selected by the American Society of Civil Engineers (ASCE) aerospace division for the Outstanding Technical Contribution Award of 2016. He became a NASA Innovative Advanced Concepts (NIAC) Fellow in 2019.

Research

Physics of rocket exhaust interacting with soil during planetary landings
Lunar and asteroid soil mechanics and regolith physics
Planetary surface technology development (rovers, mining, construction, resource processing)
Sensors for measuring dust during planetary landings
Economics of space commercial activity

Publications

Metzger, Philip T., “Erosion rate of lunar soil under a landing rocket, part 2:
benchmarking and predictions,” in review at Icarus, 01-2024.
Metzger, Philip T., “Erosion rate of lunar soil under a landing rocket, part 1:
identifying the rate-limiting physics,” in review at Icarus, 01-2024.
Dotson, B., P. Metzger, J. Hafner, A. Shackelford, K. Birkenfeld, D. Britt, A. Ford, R. Truscott, S. Truscott, J. Zavaleta, J. Zemke, K. Purvis, M. Scudder, C. Johnson, J. Galloway, J. DeShetler, “Analysis of fine particles from the first Starship orbital test flight,” In Earth & Space 2024.
Dotson, B., D. Sanchez Valencia, C. Millwater, P. Easter, J. Long-Fox, D. Britt, and P. Metzger, “Cohesion and Shear Strength of Compacted Lunar and Martian Regolith Simulants,” Icarus 411 (2024): 115943.
Peale, Robert E., Dinidu Hathnagoda, Cameron Kelley, Chris J. Fredricksen, Christian Walker, Camilo Posada, Julia Zorovich et al. “Laser particle sizer for lunar plume-surface interaction studies.” In Laser Radar Technology and Applications XXVIII, vol. 12537, pp. 67-74. SPIE, 2023.
Metzger, Philip T., “Economics of In-Space Industry and Competitiveness of Lunar-Derived Rocket Propellant,” Acta Astronautica 207, 425-444 (June 2023).
Kuhns, Matthew, Roger J. Kuhns, Forrest Meyan, Philip Metzger, Hunter Williams, and Kris Zacny. “Rocket Mining for Lunar and Mars ISRU.” In: Handbook of Space Resources, eds. Viorel Badescu, Kris Zacny, Yoseph Bar-Cohen, Springer-Nature (Cham, Switzerland, 2023), pp. 491 – 520.
Sapkota, Dhaka, Philip Metzger, Brandon Dotson, Aidan St John, and Madhu Devkota. “Characterizing a subsonic jet-regolith interaction at room temperature.” In AAS/Division for Planetary Sciences Meeting Abstracts, vol. 55, no. 8, pp. 220-15. 2023.
Dotson, B., H. Sargeant, C. Millwater, P. Easter, D. Sanchez, Valencia, J. Long-Fox, D. Britt, and P. Metzger, “New Insights into the Physical Properties of Regolith.” LPI Contrib. No. 2806, 54th Lunar and Planetary Science Conference, March 13-17, 2023, Abs. no. 1406.
Metzger, Philip T., and Greg W. Autry. “The Cost of Lunar Landing Pads with a Trade Study of Construction Methods.” New Space 11, no. 2 (2023), 97-123.
Metzger, Philip T., “Economic Modeling of the Competitiveness of Lunar Water Over Earth-Launched Water, Including Wright’s Law, Optimization of Reliability, and Economies of Scale,” Space Resources Roundtable XXII, Golden CO, June 7-10, 2022.
Peale, R. E., C. J. Fredricksen, C. L. Barrett, A. G. Otero, A. R. Jack, F. J. Gonzalez, D. Sapkota, A. R. Dove, and P. T. Metzger. “Laser particle sizer for plume-induced ejecta clouds.” In Laser Radar Technology and Applications XXVII, vol. 12110, pp. 15-22. SPIE, 2022.
Metzger, Philip T., W. M. Grundy, Mark V. Sykes, Alan Stern, James F. Bell III, Charlene E. Detelich, Kirby Runyon, Michael Summers, “Moons Are Planets: Scientific Reductionism Versus Cultural Teleology in the Taxonomy of Planetary Science,” Icarus 374, 114768, Mar. 1, 2022.
Fontes, Douglas, James G. Mantovani, and Philip Metzger. “Numerical estimations of lunar regolith trajectories and damage potential due to rocket plumes.” Acta Astronautica 195 (2022): 169-182.
Fontes, Douglas H., and Philip T. Metzger. “Evaluation of Different RANS Turbulence Models for Rocket Plume on Mars Environment.” In AIAA SCITECH 2022 Forum, p. 0741. 2022.
Fontes, Douglas H., and Philip T. Metzger. “Rocket Plume Interacting with Mars Soil Particulates.” In AIAA SCITECH 2022 Forum, p. 0742. 2022.
Metzger, Philip T., Dhaka Sapkota, Jack Fox, and Nicholas Bennett, “Aqua Factorem: Ultra Low Energy Lunar Water Extraction,” final report, NASA Innovative Advanced Concepts (NIAC) Phase I, NASA grant no. 80NSSC20K1022, University of Central Florida, March 15, 2021.
Neal, Clive, Carle Pieters, Angel Abbud-Madrid, Jack Burns, Kerri Donaldson Hanna, Nick Dygert, Bethany Ehlmann, Lindy Elkins-Tanton, Amy Fagan, Ian Garrick-Bethell, Timothy Grove, James W Head, Mihaly Horanyi, Brad Jolliff, Erick Malaret, Philip Metzger, Kirby Runyon, Chip Shearer, Sonia Tikoo, Ryan N Clegg Watkins, Kris Zacny, and Nicolle Zellner, “Long-Term Commitment to Explore and Sustain our Earth-Moon Environment.” Planetary Science and Astrobiology Decadal Survey 2023-2032 white paper e-id. 401; Bulletin of the American Astronomical Society, Vol. 53, Issue 4, e-id. 401 (2021).
Metzger, Philip T., Kris Zacny, and Phillip Morrison. “Erratum for “Thermal Extraction of Volatiles from Lunar and Asteroid Regolith in Axisymmetric Crank-Nicholson Modeling” by Philip T. Metzger, Kris Zacny, and Phillip Morrison.” Journal of Aerospace Engineering 34, no. 5 (2021): 08221002.
Landsman, Zoe, Cody Schultz, Daniel Britt, Makayla Peppin, Ryan Kobrick, Philip Metzger, and Nina Orlovskaya, “Phobos Regolith Simulants PGI-1 and PCA-1.” Advances in Space Research 67(10) (May 2021), 3308 – 3327.
Chambers, W.A., A.R. Dove, C.T. Cox, and P.T., Metzger, “Plume-Surface Interaction Phenomena Observed in Vacuum Microgravity,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 22 – 31.
Gelino, Nathan J., Robert P. Mueller, Robert W. Moses, James G. Mantovani, Philip T. Metzger, Brad C. Buckles and Laurent Sibille, “Off Earth Landing and Launch Pad Construction—A Critical Technology for Establishing a Long-Term Presence on Extraterrestrial Surfaces,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 855 – 869.
Kuhns, Matthew, Philip Metzger, Adrienne Dove, Jared Byron, Stefan Lamb, Tyler Roberson, Laurence Lohman, Wesley Chambers, Greg Rixon, Roger Kuhns, Manish Mehta and Paul van Susante, “Deep Regolith Cratering and Plume Effects Modeling for Lunar Landing Sites,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 62 – 78.
Kuhns, Matthew, Philip Metzger, Zohaib Hasnain and Kris Zacny, “Instant Landing Pads for Lunar Missions,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 1027 – 1032.
Kuhns, Matthew, Roger Kuhns, Philip Metzger, Kris Zacny and Noah Rhys, “Practical and Economic Rocket Mining of Lunar Ice,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 444 – 457.
Metzger, P.T. and J.G. Mantovani, “The Damage to Lunar Orbiting Spacecraft Caused by the Ejecta of Lunar Landers,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 136 – 145.
Montes, Jeffrey, Jessy Kate Schingler and Philip Metzger, “Pad for Humanity: Lunar Spaceports as Critical Shared Infrastructure,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 1272 – 1284.
Mueller, Robert P., Paul van Susante, Eric Reiners and Philip T. Metzger, “NASA Lunabotics Robotic Mining Competition 10th Anniversary (2010–2019): Taxonomy and Technology Review,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 497 – 510.
Peppin, Makayla, Cody Schultz, Daniel Britt, Philip Metzger, Zoe Landsman, Kevin M. Cannon, Christian Sipe, Yuxue Sun, “Developing a Standard Method to Test Rheology of Regolith Simulants,” Proceedings of Earth & Space 2021: 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, April 19-23, 2021 (virtual conference), pp. 181 – 187.
Fontes, D., J. Mantovani, and P. Metzger, “Lunar Regolith Particles Interacting with Lander Rocket Plume at Lower Altitudes,” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Kuhns, R., P. Metzger, M. Kuhns, Z. Hasnain, K. Tangsali, “Rocket Plumes and Aeolian-like Bedforms in Regolith,” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Metzger, P. T., D. H. Fontes, D. Sapkota, M. Phillippe, A. St. John, E. Smith, and D. Britt, “Software Model to Support Lunar Lander Blast Effects Mitigation,” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Metzger, P. T., A. Dove, M. Conroy, D. Sapkota, J. Gloria, A. O’Reilly, A. St. John, and E. Smith, “Measuring Plume Effects of Lunar Landing and Launch: Ejecta Sheet Tracking, Opacity, and Regolith Maturity (Ejecta STORM),” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Sapkota, D., P. Metzger, and M. Phillippe, “Gravity Scaling of the Cratering Mechanism by a Cold Turbulent Subsonic Jet,” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Sapkota, D., P. Metzger, A. St. John, and E. Smith, “Beneficiation in Space: a Booster for In Situ Resource Utilization,” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Metzger, Philip T., “Trade Study of Techniques to Build Lunar Landing Pads,” 11th Joint Planetary and Terrestrial Mining Sciences Symposium and Space Resources Roundtable (virtual), June 7-11, 2021.
Sapkota, D., P. Metzger, J. Fox, N. Bennett, “An Efficient Procedure for Lunar Ice Exploitation,” 11th Joint Planetary and Terrestrial Mining Sciences Symposium and Space Resources Roundtable (virtual), June 7-11, 2021.
Metzger, P. T., A. Dove, M. Conroy, D. Sapkota, J. Gloria, A. O’Reilly, A. St. John, and E. Smith, “Measuring Plume Effects of Lunar Landing and Launch: Ejecta Sheet Tracking, Opacity, and Regolith Maturity (Ejecta STORM),” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Metzger, P. T., D. H. Fontes, D. Sapkota, M. Phillippe, A. St. John, E. Smith, and D. Britt, “Software Model to Support Lunar Lander Blast Effects Mitigation,” 2021 NASA Exploration Science Forum and European Lunar Symposium (virtual), July 20-23, 2021.
Metzger, P., D. Sapkota, J. Fox, N. Bennett, A. St. John, And E. Smith, “Deep Reduction of Energy Requirement for Lunar Ice Extraction,” Plenary, Luxembourg Space Resources Week (virtual), April 19 – 22, 2021.
Kuhns, R., P. Metzger, M. Kuhns, Z. Hasnain, K. Tangsali, “Rocket Plumes and Aeolian-like Bedforms in Regolith,” 52nd Lunar and Planetary Science Conference 2021 (LPI Contrib. No. 2548), abstr. no. 2671.
Metzger, P. T., A. Dove, M. Conroy, J. Gloria, A. O’Reilly, A. St. John, “Ejecta Sheet Tracking, Opacity, and Regolith Maturity (Ejecta STORM): an Instrument for Lunar Landing Plume Effects and Dust Dynamics,” 52nd Lunar and Planetary Science Conference 2021 (LPI Contrib. No. 2548), abstr. no. 2616.
Metzger, P. T., W. M. Grundy, M. V. Sykes, S. A. Stern, J. F. Bell III, C. E. Detelich, K. D. Runyon, and M. E. Summers, “Reductionist vs. Folk Taxonomies in Planetary Science,” 52nd Lunar and Planetary Science Conference 2021 (LPI Contrib. No. 2548), abstr. no. 1083.
Lewicki, Chris, Amara Graps, Martin Elvis, Philip Metzger, and Andrew Rivkin. “Furthering Asteroid Resource Utilization in the Next Decade through Technology Leadership.” NASA Planetary Science Decadal Survey White Paper, arXiv preprint arXiv:2103.02435 (July, 2020).
Watkins, Ryan N., Philip T. Metzger, Manish Mehta, Daoru Han, Parvathy Prem, Laurent Sibille, Adrienne Dove, Bradley Jolliff, Daniel P. Moriarty III, Donald C. Barker, Ed Patrick, Matthew Kuhns, Michael Laine, Charles F. Radley, “Understanding and Mitigating Plume Effects During Powered Descents on the Moon and Mars.” NASA Planetary Science Decadal Survey White Paper, arXiv preprint arXiv::2102.12312 (July, 2020).
Watkins, R. N., P. T. Metzger, D. Eppler, M. Munk, A. Dove, and D. P. Moriarty, “Understanding Rocket Exhaust Effects in Polar Regions During Powered Descent on the Moon,” Artemis Science White Papers, LPI Contribution, Abs. no. 2059 (Sept. 8, 2020).
Rivkin, Andrew S., Moses Milazzo, Aparna Venkatesan, Elizabeth Frank, Monica R. Vidaurri, Phil Metzger, and Chris Lewicki. “Asteroid Resource Utilization: Ethical Concerns and Progress.” NASA Planetary Science Decadal Survey White Paper, arXiv preprint arXiv:2011.03369 (July, 2020).
Wittal, Matthew M., James Mantovani, James R. Philips III, and Philip Metzger, “The Behavior of High-Velocity Dust Generated by Lander Plumes in the Lunar Environment”, 2020 AAS/AIAA Astrodynamics Specialist Conference, South Lake Tahoe, Aug. 9-13, 2020.
Austin, Alex, Brent Sherwood, John Elliott, Anthony Colaprete, Kris Zacny, Philip Metzger, Michael Sims, et al. “Robotic Lunar Surface Operations 2.” Acta Astronautica 176 (2020): 424-437.
Metzger, Philip T., Kris Zacny, and Phillip Morrison, “Thermal Extraction of Water Ice from Lunar Regolith in Axi-Symmetric Crank-Nicholson Modeling,” Journal of Aerospace Engineering 33 (6), 04020075 (2020).
Metzger, Philip T., and Daniel T. Britt, “Model for Asteroid Regolith to Guide Simulant Development,” Icarus 350 (June 2020): 113904.
Tadd Yeager, Douglas Fontes, Philip Metzger, Michael Kinzel, “Numerical Model of Jet Impingement and Particle Trajectories in a Lunar Landing Event Using an Euler-Euler Approach,” 2020 AIAA SciTech Forum, Orlando, FL, 2020.
Metzger, Philip T., and James Mantovani, “Dust Transport and Its Effects Due to Landing Spacecraft,” In: The Impact of Lunar Dust on Human Exploration, ed. by Joel Levine. Cambridge Scholars Publishing (2020), pp 88 – 111.
Metzger, Philip T., “Dust transport and its effects due to landing spacecraft,” In: Workshop on the Effects of Dust to Human Lunar Exploration, Houston, TX, Feb. 11-13, 2020.
Brisset, Julie, Thomas Miletich, and Philip Metzger, “Thermal Extraction of Water Ice from the Lunar Surface – A 3D Numerical Model,” Planetary and Space Science (Feb. 2020): 105082.
Watkins, R. N., P. T. Metzger, D. Eppler, M. Munk, A. Dove, and D. P. Moriarty, “Understanding Rocket Exhaust Effects in Polar Regions During Powered Descent on the Moon,” Artemis Science White Papers, LPI Contribution, Abs. no. 2059 (Sept. 8, 2020).
Metzger, Philip T., “Quantifying Engine Exhaust Ejecta from Landing Large Spacecraft on the Moon,” NASA Exploration Science Forum, virtual due to COVID-19, July 8-10, 2020.
Moriarty, D. P., N. E. Petro, B. A. Cohen, P. Metzger, M. E. Zolensky, R. N. Watkins, S. N. Valencia et al. “AEGIS: Aerogel Experiment Gathering Impactor Samples.” In: Lunar Surface Science Workshop, held 28-29 May, 2020 (Virtual). LPI Contribution No. 2241. Abs. no. 5141.
Whizin, A. D., P. T. Metzger, C. B. Dreyer, R. J. Focia, and C. D. Asquith. “In-Situ Construction and Resource Extraction for Long-Term Lunar Surface Exploration.” In: Lunar Surface Science Workshop, held 28-29 May, 2020 (Virtual). LPI Contribution No. 2241. Abs. no. 5170.
Whizin, A. D., P. Metzger, C. Dreyer, C. Phillips-Lander, C. Asquith, R. Focia, and K. Retherford. “Innovating Lunar ISRU Technologies for Long-Term Exploration and Habitation.” 3rd International Planetary Caves Conference, held 18-21 February, 2020 in San Antonio, Texas. LPI Contribution No. 2197, 2020, Abs. no.1078.
Britt, Daniel T., Kevin M. Cannon, Kerri Donaldson Hanna, Joanna Hogancamp, Olivier Poch, Pierre Beck, Dayl Martin, Jolantha Escrig, Lydie Bonal and Philip T. Metzger, “Simulated asteroid materials based on carbonaceous chondrite mineralogies,” Meteoritics and Planetary Science 54, no. 9 (2019): 2067-2082.
Kornuta, David, Angel Abbud-Madrid, Jared Atkinson, Jonathan Barr, Gary Barnhard, Dallas Bienhoff, Brad Blair, Vanessa Clark,, Justin Cyrus, Blair DeWitt, Chris Dreyer, Barry Finger, Jonathan Goff, Koki Ho, Laura Kelsey, Jim Keravala, Bernard Kutter, Philip Metzger, Laura Montgomery, Phillip Morrison, Clive Neal, Erica Otto, Gordon Roesler, Jim Schier, Brandon Seifert, George Sowers, Paul Spudis, Mark Sundahl, Kris Zacny, Guangdong Zhu, “Commercial lunar propellant architecture: A collaborative study of lunar propellant production.” Reach 13 (2019): 100026.
Elliott, J., A Austin, T Colaprete, AS Howe, P Metzger, R Casillas, B Sherwood, M Smith, V Vendiola, G Voecks, K Zacny, “ISRU in Support of an Architecture for a Self-Sustained Lunar Base,” In: 70th International Astronautical Congress, Washington, D.C., Oct. 12-25, 2019.
Howe, A. Scott, Raul Polit-Casillas, Alex Austin, John Elliott, Aaron Parness, Brent Sherwood, Miles Smith, Gerald Voecks, Anthony Colaprete, Terry Fong, Sandra Magnus, Philip T. Metzger, Harrison H. Schmitt, Michael Sims, Kris Zacny, “Planetary Autonomous Construction System (P@X),” paper no. IAC-19-D3.2A.4×50071, 70th International Astronautical Congress, Washington, D.C., Oct. 21-24, 2019.
Polit-Casillas, Raul, John Elliott, Alex Austin, Scott Howe, Aaron Parness, Brent Sherwood, Miles Smith, Gerald Voecks, Anthony Colaprete, Terry Fong, Sandra Magnus, Phil Metzger, Harrison H Schmitt, Michael Sims, and Kris Zacny, “Architectural design considerations for a robotic power infrastructure on the moon,” paper no. IAC-19-C3.2.9×52752, 70th International Astronautical Congress, Washington, D.C., Oct. 21-24, 2019.
Kakish, Zahi M., F. RodrÃguez-Lera, D. Bischel, A. Mosquera, R. Baumghar, S. Kaczmarek, T. Seabrook, P. Metzger, and J.L. Galanche, “Open-source AI Assistant for Cooperative Mult-agent Systems for Lunar Prospecting Missions,” In: 8th European Conference for Aeronautics and Space Sciences, Madrid, Spain, July 1-4, 2019.
Metzger, Philip T., Daniel T. Britt, Stephen Covey, Cody Schultz, Kevin M. Cannon, Kevin D. Grossman, James G. Mantovani, and Robert P. Mueller, “Measuring the Fidelity of Asteroid Regolith and Cobble Simulants,” Icarus 321 (2019): 632-646.
Metzger, Philip T., Mark V. Sykes, Alan Stern, and Kirby Runyon. “The reclassification of asteroids from planets to non-planets.” Icarus 319 (2019): 21-32.
Cannon, K.M., Daniel T. Britt, and Philip T. Metzger, “Strategic Regolith Processing on the Moon and Mars,” In: Space Resources Roundtable 2019, Golden, Colorado. https://isruinfo.com/public/docs/srr20_ptmss/4-1%20Strategic%20Regolith%20Processing%20on%20the%20Moon%20and%20Mars-Cannon.zip.
Metzger, P.T. and D.T. Britt, “Mitigating Lander Plume Effects with Space Resources,” In: Lunar ISRU 2019 – Developing a New Space Economy Through Lunar Resources and Their Utilization, held 15-17 July, 2019 in Columbia, Maryland. LPI Contribution No. 2152, Abs. no. 5055.
Metzger, P.T., “High Fidelity Model of Lunar Volatile Extraction Indicates Challenges and Solutions to Economic Resource Recovery,” In: Lunar ISRU 2019 – Developing a New Space Economy Through Lunar Resources and Their Utilization, held 15-17 July, 2019 in Columbia, Maryland. LPI Contribution No. 2152, Abs. no. 5090.
Raut, U., K. D. Retherford, V. Poenitzsch, D. M. Hurley, M. A. Miller, P. Metzger, A. D. Whizin, and M. Poston. “IS5-In-Situ Resource Utilization: Scouting│ Sampling│ Separation│ Synthesis│ Storage–A Concept Study.” In: Lunar ISRU 2019 – Developing a New Space Economy Through Lunar Resources and Their Utilization, held 15-17 July 2019 in Columbia, Maryland. LPI Contribution No. 2152, Abs. no. 5089.
Runyon, K. D., P. T. Metzger, S. A. Stern, and J. Bell. “Dwarf Planets are Planets, Too: Planetary Pedagogy after New Horizons.” In: Pluto System After New Horizons, held 14-18 July, 2019 in Laurel, Maryland. LPI Contribution No. 2133, Abs. no. 7016.
Metzger, P.T., D. T. Britt, K. M. Cannon, M. Kinzel, D. Fontes, and D. A. Kring, “Lander Plume Effects at Outpost on Shackleton Crater Rim,” In: NASA Exploration Science Forum, NASA Ames Research Center, CA, July 2019.
Zacny, Kris, Edward B. Bierhaus, Daniel T. Britt, Benton Clark, Christine M. Hartzell, Leslie Gertsch, Anton V. Kulchitsky et al. “Geotechnical Properties of Asteroids Affecting Surface Operations, Mining, and In Situ Resource Utilization Activities.” In Primitive Meteorites and Asteroids, pp. 439-476. Elsevier, 2018.
Kornuta, David, Angel Abbud-Madrid, Jared Atkinson, Jonathan Barr, Gary Barnhard, Dallas Bienhoff, Brad Blair, Vanessa Clark,, Justin Cyrus, Blair DeWitt, Chris Dreyer, Barry Finger, Jonathan Goff, Koki Ho, Laura Kelsey, Jim Keravala, Bernard Kutter, Philip Metzger, Laura Montgomery, Phillip Morrison, Clive Neal, Erica Otto, Gordon Roesler, Jim Schier, Brandon Seifert, George Sowers, Paul Spudis, Mark Sundahl, Kris Zacny, Guangdong Zhu. Commercial Lunar Propellant Architecture: A Collaborative Study of Lunar Propellant Production. United Launch Alliance, 2018.
John Lane, Takis Kasparis, Silas Michaelides, and Philip Metzger, “A Phenomenological Relationship Between Vertical Air Motion and Disdrometer Derived A-b Coefficients,” Atmospheric Research 208, 94 -105 (Aug. 2018).
Bischel, Drew, Zahi Kakish, Ana Mosquera, Redouane Boumghar, Phil Metzger, J. L. Galache, Sylvester Kaczmarek, and Tim Seabrook. “Cooperative Multi-Agent Systems for Mission Planning.” NASA Frontier Development Lab Technical Memorandum. (August, 2018).
Covey, S. D., J. S. Lewis, P. T. Metzger, and D. T. Britt. “Developing carbonaceous chondrite asteroid simulants.” Proceedings of Earth and Space 2018: Engineering, Science, Construction, and Operations in Challenging Environments, Cleveland, OH, April 9-12, 2018.
Covey, Steven D., and Metzger, Philip T. “Extruded Clay-Based Regoliths for Construction on Mars, Phobos, and NEAs.” Proceedings of Earth and Space 2018: Engineering, Science, Construction, and Operations in Challenging Environments, Cleveland, OH, April 9-12, 2018.
Daniel T. Britt, Cody Schultz, and Philip T. Metzger, “Thermal Cycling and the Strength of Primitive Asteroids,” Proceedings of Earth and Space 2018: Engineering, Science, Construction, and Operations in Challenging Environments, Cleveland, OH, April 9-12, 2018.
Philip T. Metzger, Seamus Anderson and Anthony Colaprete¬, “Experiments indicate regolith is looser in the lunar polar regions than at the lunar landing sites,” Proceedings of Earth and Space 2018: Engineering, Science, Construction, and Operations in Challenging Environments, Cleveland, OH, April 9-12, 2018.
Philip T. Metzger, “Modeling the Thermal Extraction of Water Ice from Regolith,” Proceedings of Earth and Space 2018: Engineering, Science, Construction, and Operations in Challenging Environments, Cleveland, OH, April 9-12, 2018.
Lupisella, Mark, et al. incl. P. Metzger, “Apollo Environment Sampling: A 50 Year Experiment,” In: NASA Exploration Science Forum, NASA Ames Research Center, June 26-28, 2018.
Britt, D. T., K. M. Cannon, C. D. Schultz, Z. Landsman, P. Metzger, and M. Peppin. “Exploring the Physical Properties of High Fidelity Martian and Phobos Regolith Simulants: Support for Mission Development and Hardware Design.” In: 49th Lunar and Planetary Science Conference, 19-23 March, 2018, held at The Woodlands, Texas LPI Contribution No. 2083, Abs. no. 1943.
Cannon, K. M., D. T. Britt, P. T. Metzger, Z. A. Landsman, S. D. Covey, C. Schultz, M. Peppin, T. M. Smith, and R. Fritsche. “New High Fidelity Martian and Phobos Regolith Simulants: Enabling Tools for Exploring the Mars System and ISRU Development.” In: 49th Lunar and Planetary Science Conference, 19-23 March, 2018, held at The Woodlands, Texas LPI Contribution No. 2083, Abs. no. 2086.
Landsman, Z. L., P. T. Metzger, A. S. Rivkin, D. T. Britt, K. M. Cannon, C. A. Hibbitts, and K. R. Stockstill-Cahill. “A Spectroscopic Study of High-Fidelity Simulated Primitive Asteroid Regolith.” In: 49th Lunar and Planetary Science Conference, 19-23 March, 2018, held at The Woodlands, Texas LPI Contribution No. 2083, Abs. no. 2297.
Metzger, P. T., D. T. Britt, K. M. Cannon, C. D. Schultz, Z. Landsman, M. Peppin, and S. D. Covey. “Measuring the fidelity of asteroid regolith simulants.” In: 49th Lunar and Planetary Science Conference, 19-23 March, 2018, held at The Woodlands, Texas LPI Contribution No. 2083, Abs. no. 2926.
Metzger, P., D. Britt, S. Covey, and J. S. Lewis. “Figure of Merit for Asteroid Regolith Simulants.” In: European Planetary Science Congress 2017, vol. 11, Abs. no. EPSC2017-436. 2017.
Britt, D.T., and P. Metzger, “The Technology and Future of In-Situ Resource Utilization: a Capstone Seminar this Spring,” In: NASA Planetary Science Vision 2050 Workshop, Washington, DC, Feb. 27-28, 2017.
Metzger, Philip, “Economic Planetary Science in the 21st Century,” In: NASA Planetary Science Vision 2050 Workshop, Washington, DC, Feb. 27-28, 2017.
Metzger, Philip T., “Space Development and Space Science Together: an Historic Opportunity,” Space Policy 37 (2), 77-91 (2016).
Amara L. Graps, JL Galache, Vishnu Reddy, Martin Elvis, Andy Rivkien, Paolo Tanga, Migo Mueller, Philippe Blondel, Patrick Michel, Henry Hsieh, Petr Pravec, Alex Parker, Pauli Laine, Philip Metzger, Daniel Britt, Philipp Maier, Bill Hartmann, Jan Thimo Grundmann, “ASIME 2016 White Paper: In-Space Utilisation of Asteroids: ‘Answers to Questions from the Asteroid Miners’.” Asteroid Science Intersections with In-Space Mine Engineering 2016, Luxembourg City, 21-22 September 2016.
K. Zacny, P. Metzger, K. Luczek, J. Mantovani, R. Mueller, “The World is Not Enough (WINE): Harvesting Local Resources for Eternal Exploration of Space,” AIAA Space 2016, paper no. AIAA 2016-5279.
Chambers, Wesley A., and Philip T. Metzger, “Regolith Instability Caused by Gas Diffusion: A Case Study of the Asteroid Redirect Mission,” Proceedings of Earth and Space 2016: Engineering, Science, Construction, and Operations in Challenging Environments, Orlando, FL, April 11-15, 2016.
Covey, S.D., J.S. Lewis, P.T. Metzger, D.T. Britt, and S.E. Wiggins, “Simulating the Surface Morphology of a Carbonaceous Chondrite Asteroid,” Proceedings of Earth and Space 2016: Engineering, Science, Construction, and Operations in Challenging Environments, Orlando, FL, April 11-15, 2016.
Metzger, Philip T., “Rocket Exhaust Blowing Soil in Near Vacuum Conditions is Faster than Predicted by Continuum Scaling Laws,” Proceedings of Earth and Space 2016: Engineering, Science, Construction, and Operations in Challenging Environments, Orlando, FL, April 11-15, 2016.
Metzger, Philip T., Daniel T. Britt, Stephen D. Covey, and John S. Lewis, “Results of the 2015 Workshop on Asteroid Simulants,” Proceedings of Earth and Space 2016: Engineering, Science, Construction, and Operations in Challenging Environments, Orlando, FL, April 11-15, 2016.
Metzger, Philip T., Kris Zacny, Kathryn Luczek, Magnus Hedlund, “Analysis of Thermal/Water Propulsion for CubeSats That Refuel in Space,” Proceedings of Earth and Space 2016: Engineering, Science, Construction, and Operations in Challenging Environments, Orlando, FL, April 11-15, 2016.
Mueller, R.P., et al, “Automated Additive Construction (AAC) for Earth and Space Using In-situ Resources,” Proceedings of Earth and Space 2016: Engineering, Science, Construction, and Operations in Challenging Environments, Orlando, FL, April 11-15, 2016.
Susante, Paul van, and Philip T. Metzger, “Design, Test and Simulation of Lunar and Mars Landing Pad Soil Stabilization Built with In-Situ Rock Utilization,” Proceedings of Earth and Space 2016: Engineering, Science, Construction, and Operations in Challenging Environments, Orlando, FL, April 11-15, 2016.
Chris Culbert, Diane Linne, Faith Chandler, Leslie Alexander, Sharon Jefferies, Kriss J Kennedy, Mark Lupisella, Phil Metzger, Nathan Moore, and Karen Taminger, NASA Technology Roadmap TA-04, Human Exploration Destination Systems, NASA, July 2015.
Lane, John E. and Philip T. Metzger, “Estimation of Apollo lunar dust transport using optical extinction measurements,” Acta Geophysica 63 (2), 568-599 (2015).
Metzger, Philip T., “Mining on the Moon: Take a Look at a Space Settlement of the Future,” Boys’ Life, September 2015 issue, pp. 20-23 (cover story).
Sengupta, A., M. Mehta, J. Vizcaino, and P. Metzger, “Plume Impingement Induced Surface Erosion During Retro-Propulsive Landings on Mars”, In: 11th International Planetary Probe Workshop (June 16–20, 2014 in Pasadena, California), abstract no. 8118.
Berger, Kyle J., Anshu Anand, Philip T. Metzger, and Christine M Hrenya,, “Erratum: Role of collisions in erosion of regolith during a lunar landing (vol 87, 022205, 2013)”, Physical Review E 91(1), 1-1 (2015).
Lane, John E., Takis Kasparis, Philip T. Metzger, and W. Linwood Jones, “In Situ Disdrometer Calibration Using Multiple DSD Moments,” Acta Geophysica 62 (6), 1450-1477 (2014).
Lane, J.E., and Philip T. Metzger, “Image Analysis Based Estimates of Regolith Erosion Due to Plume Impingement Effect,” Proceedings of Earth and Space 2014: Engineering, Science, Construction, and Operations in Challenging Environments, St. Louis, MO, Oct. 27-29, 2014.
Shipley, S.T., P.T. Metzger and J.E. Lane, “Lunar Cold Trap Contamination by Landing Vehicles,” Proceedings of Earth and Space 2014: Engineering, Science, Construction, and Operations in Challenging Environments, St. Louis, MO, Oct. 27-29, 2014.
JE Lane, T Kasparis, PT Metzger, WL Jones, “Laser calibration of an impact disdrometer”, Jan 1, 2014. https://ntrs.nasa.gov/citations/20160000387
Anand, Anshu, Kyle J. Berger, Philip T. Metzger, and Christine M Hrenya, “Role of Collisions in Erosion of Regolith during a Lunar Landing,” Physical Review E 87, 022205 (2013).
Metzger, Philip T., Anthony Muscatello, Robert P. Mueller, and James Mantovani, “Affordable rapid bootstrapping of space industry and solar system civilization,” J. Aerospace Engineering 26 (1), 18-29 (2013).
Lane, John E., Linwood Jones, Takis C. Kasparis, and Philip Metzger, “Measurements of DSD second moment based on laser extinction,” 93rd American Meteorological Society Annual Meeting, Austin, TX, Jan. 6-10, 2013.
Metzger, P.T., and J. E. Lane, “Effects of Spacecraft Landing on the Moon,” abstract no. 3093, 44th Lunar and Planetary Science Conference (2013).
Long, Jason, Philip Metzger, and John Lane, “Estimating Foreign-Object-Debris Density from Photogrammetry Data,” NASA Tech Briefs, Apr. 2013.
Rickman, Doug, Christopher Immer, Philip Metzger, Emily Dixon, Matthew Pendleton, and Jennifer Edmunson. “Particle Shape in Simulants of the Lunar Regolith.” Journal of Sedimentary Research 82 (11), 823-832 (2012).
Murray, J. A., S. Benyahia , P. Metzger, and C. M. Hrenya, “Continuum Representation of a Continuous Size Distribution of Particles engaged in Rapid Granular Flow,” Physics of Fluids 24, 083303 (2012).
Lane, John E., and Philip T. Metzger, “Ballistics Model for Particles on a Horizontal Plane in a Vacuum Propelled by a Vertically Impinging Gas Jet,” Particulate Science and Technology 30(2), 196-208 (2012).
Berger, Kyle, Philip T. Metzger, and Christine M. Hrenya, “Assessment of Collision-Less Vs. Collisional Simulation of Lunar Regolith Ejection During Spacecraft Landing,” Proceedings of 2012 AIChE Annual Meeting, Pittsburgh, PA, Oct. 28 – Nov.2, 2012.
Clegg, Ryan N., Bradley L. Jolliff, and Philip T. Metzger, “Photometric Analysis of the Apollo Landing Sites,” Proceedings of Earth and Space 2012: Engineering, Science, Construction, and Operations in Challenging Environments, Pasadena, CA, Apr. 15-18, 2012.
Lane, John, Philip Metzger, and Bruce Vu, “Trajectory Modeling of Particles Propelled by a Multi-Engine Rocket Plume on the Lunar Surface”, Proceedings of Earth and Space 2012: Engineering, Science, Construction, and Operations in Challenging Environments, Pasadena, CA, Apr. 15-18, 2012.
Lane, John, Steven Trigwell, Paul Hintze, and Philip Metzger, “Further Analysis on the Mystery of the Surveyor III Dust Deposits,” Proceedings of Earth and Space 2012: Engineering, Science, Construction, and Operations in Challenging Environments, Pasadena, CA, Apr. 15-18, 2012.
Metzger, P. T., R. P. Mueller, and P. E. Hintze. “Precursor activities to solve plume cratering problems for human-class mars landers.” Concepts and Approaches for Mars Exploration, held June 12-14, 2012 in Houston, Texas. LPI Contribution No. 1679, Abs. no. 4359.
Philip Metzger and Christopher Immer, “Automated and Manual Rocket Crater Measurement Software,” NASA Tech Briefs, Jan, 2012.
Metzger, Philip T., “Granular Mechanics and Regolith Operations Laboratory,” Tech Transfer KSC News 4 (2), pp. 6-8 (Fall/Winter 2011).
“NASA’s Recommendations to Space-Faring Entities: How to Protect and Preserve the Historic and Scientific Value of U.S. Government Lunar Artifacts,” NASA (July 2011).
Philip T. Metzger, Greg Galloway, James Mantovani, Kris Zacny and Jack Craft, “Low Force Icy Regolith Penetration Technology,” NASA/Technical Memorandum 2011-216302.
Immer, Christopher D., John E. Lane, Philip T. Metzger, and Sandra Clements, “Apollo Video Photogrammetry Estimation of Plume Impingement Effects,” Icarus 214, 46–52 (July, 2011).
Metzger, Philip T., Jacob Smith, and John E. Lane, “Phenomenology of soil erosion due to rocket exhaust on the Moon and the Mauna Kea lunar test site,” Journal of Geophysical Research – Planets 116, E06005, (June 2011).
LaMarche, Casey Q., Jennifer S. Curtis, and Philip T. Metzger, “Permeability of JSC-1A: A Lunar Soil Simulant,” Icarus 212 (1), 383-389 (March 2011).
Immer, Christopher D., Philip Metzger, Paul Hintze, Andrew Nick and Ryan Horan, “Apollo 12 Lunar Module Exhaust Plume Impingement on Lunar Surveyor III,” Icarus 211 (2), 1089-1102 (February 2011).
Metzger, Philip T., “Nature’s Way of Making Audacious Space Projects Viable,” 100 Year Starship Study Public Symposium, Orlando, FL, Sep.30 – Oct. 2, 2011.
Clegg, Ryan N., Philip T. Metzger, Stephen Huff, and Luke B. Roberson, “Lunar soil erosion physics for landing rockets on the Moon,” abstract no. 1450, 42nd Lunar and Planetary Science Conference (2011).
Lane, John E., Philip T. Metzger, and Allen R. Wilkinson, “A Review of Discrete Element Method (DEM) Particle Shapes and Size Distributions for Lunar Soil,” NASA TM- 2010-216257, NASA Glenn Research Center, Cleveland, OH (December 2010).
Metzger, Philip T., John E. Lane, Robert A. Carilli, Jason M. Long, and Kathy L. Shawn, “Photogrammetry and Ballistic Analysis of a High-Flying Projectile in the STS-124 Space Shuttle Launch,” Acta Astronautica 67, 217-229 (2010).
Mueller, Robert P., Philip T. Metzger, and James G. Mantovani, “Regolith as a resource in solar system human and robotic exploration,” paper no. IAC-10-A3.1.7, Proceedings of the 61st International Astronautics Conference, Prague, Czech Republic, Sept. 27 – Oct. 1, 2010.
Gamsky, Jacob, and Philip T. Metzger, “The Physical State of Lunar Soil in the Permanently Shadowed Craters of the Moon,” Proceedings of Earth and Space 2010: Engineering, Science, Construction, and Operations in Challenging Environments, Honolulu, HI, Mar. 14-17, 2010.
Immer, Christopher, Philip Metzger, “Rocket Cratering in Simulated Lunar and Martian Environments,” Proceedings of Earth and Space 2010, 12th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments, Honolulu, HI, Mar. 14-17, 2010.
LaMarche, Casey Q., Philip T. Metzger, and Jennifer S. Curtis, “Cratering of a Lunar Soil Simulant, JSC-1A, by a Turbulent Subsonic Jet”, Proceedings of Earth and Space 2010, 12th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments, Honolulu, HI, Mar. 14-17, 2010.
Lane, John E., Philip T. Metzger, and Jeffrey W. Carlson, “Lunar Dust Particles Blown By Lander Engine Exhaust in Rarefied and Compressible Flow,” Proceedings of Earth and Space 2010, 12th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments, Honolulu, HI, Mar. 14-17, 2010.
Rahmatian, Laila A., and Philip T. Metzger, “Soil Test Apparatus for Lunar Surfaces,” Proceedings of Earth and Space 2010: Engineering, Science, Construction, and Operations in Challenging Environments, Honolulu, HI, Mar. 14-17, 2010.
Metzger, Philip T., John E. Lane, C.D. Immer, J.N. Gamsky, W. Hauslein, Xiaoyi Li, R.C. Latta III, C.M. Donahue, “Scaling of Erosion Rate in Subsonic Jet Experiments and Apollo Lunar Module Landings,” Proceedings of Earth and Space 2010, 12th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments, Honolulu, HI, Mar. 14-17, 2010.
Mueller, Robert P., Ivan I. Townsend, James G. Mantovani, and Philip T. Metzger, “Evolution of Regolith Feed Systems for Lunar ISRU O2 Production Plants,” Proceedings of 48th AIAA Aerospace Sciences Conference, Orlando, Florida, January 4-7, 2010.
Metzger, Philip T., Mantovani, James G., Townsend, Ivan I., and Mueller, Robert P., “Integrating beneficiation into regolith conveyance systems,” Workshop on Lunar Applications of Mining and Mineral Beneficiation, Butte, Montana, October 5-7, 2010.
Metzger, Philip T., Christopher D. Immer, John E. Lane, Jacob Smith, Joseph W. Studak, and Brian F. Banker, “Rocket plume impingement on Mauna Kea lunar analog site compared with photogrammetry of Apollo lunar landing videos,” extended abstract for the First Joint Meeting of the Space Resources Roundtable and the Planetary and Terrestrial Mining Sciences Symposium (PTMSS), Golden , CO, June 8-10, 2010.
Abilleira, F; Acuna, M; Alena, R; Alonso, J; Anbar, A; Arnold, J; Arnold, J; Baalen, M; Bagdigian, B; Bearden, D; Beaty, D; Bell, M; Bitten, R; Blattnig, S; Borowski, S; Bose, D; Bowles, J; Briggs, G; Bryant, L; Bubenheim, D; Burt, I; Cataldo, B; Cerimele, C; Charles, J; Cheatwood, N; Clancey, B; Clancy, R; Clowdsley, M; Cockell, C; Conley, C; Connerney, J; Cooke, D; Coughlin, S; Craig, D; Crane, T; Cravens, T; Crisp, V; Cruz, J; Cucinotta, F; Culbert, C; Culver, G; Delory, G; Dickson, J; Doran, P; Doyle, M; Drake, B; Drake, B; Durda, D; Durston, D; Dwyer, A; Easter, R; Edwards, C; Elliott, J; Elphic, R; Engelund, W; Epp, C; Eppler, D; Feingold, H; Feldman, S; Fernandez-Remolar, D; Fisher, D; Forbes, J; Fragola, J; Gabriele, G; Gage, P; Garcia, J; Garvin, J; Gernhardt, M; Giles, B; Glass, B; Gonzales, A; Gonzales, A; Goodwinn, S; Griffin, B; Gruener, J; Guetersloh, S; Hassler, D; Hawes, M; Head, J; Health, H; Heldmann, J; Helper, M; Hill, J; Hipkin, V; Hoffman, S; James, A; Jitendra, J; Jones, H; Jones, J; Jordan, F; Karcz, J; Kerschman, R; Keyes, J; Killeen, T; Kinney, D; Kinney, D; Kliss, M; Landis, R; Lane, M; Larson, B; Laub, B; Laurini, K; Lavoie, T; Lee, P; Lemke, L; Leung, R; Levine, J; Levy, J; Lim, D; Liskowsky, D; Luhmann, J; Luna, B; Mahaffy, P; Manning, R; Manzella, D; Mattingly, R; McCann, R; McCuistion, D; McKay, C; Menrad, R; Metzger, P; Moersch, J; Moore, A; Moore, C; Moore, T; Morris, K; Mueller, R; Mulqueen, J; Murphy, N; Noreen, G; Ondler, R; Ostrach, L; Paxton, L; Peach, L; Plachta, D; Porter, L; Posner, A; Poulet, F; Powell, R; Price, H; Purves, L; Putney, B; Quinn, S; Radcliffe, T; Radzanowski, D; Rice, J; Roman, M; Russo, C; Rutledge, R; Salamon, M; Sander, M; Sanders, J; Schenker, P; Schier, J; Semones, E; Shah, B; Simonsen, L; Slavin, J; Snook, K; Squyres, S; Stoker, C; Sulzman, F; Sumrall, P; Tahu, G; Tauber, M; Tigges, M; Toups, L; Tran, H; Tri, T; Tripathi, A; Troutman, P; Tyburski, T; Venkatapathy, E; Venkatapathy, E; Volosin, J; Waits, D; Watson, K; Webbon, B; Westhelle, C; Wright, H; Wright, M; Yoder, G; Yoon, S; Zapp, E; Zavaleta, J; Zimbelman, J, Mars Design Reference Architecture 5.0, Drake, Brett, Ed., NASA SP-2009-566 (2009).
Helenbrook, Brian T., Hayley H. Shen, Michael P. Powers, and Philip T. Metzger, “Continuum modeling and discrete element simulations of elastic-quasi-static granular flow in a compressing slot,” J. Aerospace Engineering 22 (4), 415-422 (2009).
Lane, John E., Takis Kasparis, W. Linwood Jones, and Philip T. Metzger, “Spatial and Temporal Extrapolation of Disdrometer Size Distributions Based on a Lagrangian Trajectory Model of Falling Rain,” The Open Atmospheric Science Journal 3, 172-186 (2009).
Metzger, Philip T., and John E. Lane, “Electric Potential Due to a System of Conducting Spheres,” The Open Applied Physics Journal 2, 32-48 (2009).
Metzger, Philip T., Christopher D. Immer, Carly M. Donahue, Bruce T. Vu, Robert C. Latta, III, Matthew Deyo-Svendsen, “Jet-induced cratering of a granular surface with application to lunar spaceports,” J. Aerospace Engineering 22 (1), pp. 24-32 (2009).
Wilkinson, R. A.; Metzger, P. T., “Special Section: NASA Exploration 2006 Granular Materials Workshop: Science and Engineering of the Lunar Soil, Introduction,” J. Aerospace Engineering 22 (1), 1-1 (2009).
Metzger, Philip T., Robert C. Latta III, Jason M. Schuler, and Christopher D. Immer, “Craters Formed in Granular Beds by Impinging Jets of Gas,” in Proceedings of Powders and Grains 2009 (Golden, Colorado), July 14-17, 2009.
Tordesillas, Antoinette, Edward Lam, and Philip T. Metzger, “Hyperstaticity and loops in frictional granular packings,” in Proceedings of Powders and Grains 2009 (Golden, Colorado), July 14-17, 2009.
Metzger, Philip T., Xiaoyi Li, Christopher D. Immer, and John E. Lane, “ISRU Implications of Lunar and Martian Plume Effects,” Proceedings of 47th AIAA Aerospace Sciences Conference, Orlando, FL, January 5-8, 2009.
Metzger, Philip T., John E. Lane, Christopher D. Immer, and Sandra Clements, “Cratering and Blowing Soil by Rocket Engines During Lunar Landings,” in Lunar Settlements, ed. by Haym Benaroya (CRC Press, 2010), pp. 551-576. A reprint of Metzger, Philip T., John E. Lane, Christopher D. Immer, and Sandra Clements, “Cratering and blowing soil by rocket engines during lunar landings,” in Proceedings of the 6th International Conference on Case Histories in Geotechnical Engineering, Arlington, VA, August 11-16, 2008.
Metzger, Philip T., “H theorem for contact forces in granular materials,” Physical Review E 77, 011307 (2008).
Metzger, Philip T., John E. Lane, Christopher D. Immer, and Sandra Clements, “Cratering and blowing soil by rocket engines during lunar landings,” in Proceedings of the 6th International Conference on Case Histories in Geotechnical Engineering, Arlington, VA, August 11-16, 2008.
Immer, Christopher D., Philip T. Metzger, and John E. Lane, “Apollo Video Photogrammetry Estimation of Plume Impingement Effects,” in Proceedings of the 11th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments (Long Beach, California), Mar. 3-5, 2008.
Lane, John E., Philip T. Metzger, and Christopher D. Immer, “Lagrangian trajectory modeling of lunar dust particles,” in Proceedings of the 11th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments (Long Beach, California), Mar. 3-5, 2008.
Metzger, Philip T., John E. Lane, and Christopher D. Immer, “Modification of Roberts’ theory for rocket exhaust plumes eroding lunar soil,” in Proceedings of the 11th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments (Long Beach, California), Mar. 3-5, 2008.
Clegg, Ryan N., Philip T. Metzger, Stephen Huff, and Luke B. Roberson, “Lunar soil erosion physics for landing rockets on the Moon,” paper no. 4122, Proceedings of the Joint Annual Meeting of the Lunar Exploration Analysis Group (LEAG), the International Lunar Exploration Working Group (ILEWG) Conference on Exploration and Utilization of the Moon (ICEUM) and the Space Resources Roundtable (SRR), Cape Canaveral, Florida, October 28-31, 2008.
Long, J. M., J. E. Lane, and P. T. Metzger. “A Modification and Analysis of Lagrangian Trajectory Modeling and Granular Dynamics of Lunar Dust Particles.”
Joint Annual Meeting of LEAG-ICEUM-SRR, held October 28-31, 2008 in Cape Canaveral, Florida. LPI Contribution No. 1446, abs. no. 4058.
Smith, David J., Luke B. Roberson, Rob Mueller, and Phil Metzger, “Rapidly deployable blast barriers for lunar surface operations,” paper no. 4045, Proceedings of the Joint Annual Meeting of the Lunar Exploration Analysis Group (LEAG), the International Lunar Exploration Working Group (ILEWG) Conference on Exploration and Utilization of the Moon (ICEUM) and the Space Resources Roundtable (SRR), Cape Canaveral, Florida, October 28-31, 2008.
Wittbrodt, Audelia C., and Philip T. Metzger. “Material Damage from Impacts of Lunar Soil Particles Ejected by the Rocket Exhaust of Landing Spacecraft.” NASA Technical Report KSC-2008-290 (2008).
Metzger, Philip T., “Space, the Choice is Endless,” Physics World 19, pp. 42-43 (February, 2007).
Behringer, R. P. (Bob), Allen Wilkinson, Philip T. Metzger, “Selected papers from the First Workshop on Granular Materials in Lunar and Martian Exploration at NASA’s Kennedy Space Center in February 2005: Editorial,” Granular Matter 9(5), 293-294 (2007).
Metzger, Philip T., B.T. Vu, D.E. Taylor, M.J. Kromann, M. Fuchs, B. Yutko, A. Dokos, Christopher D. Immer, J.E. Lane, Michael B. Dunkel, Carly M. Donahue, and R.C. Latta III, “Cratering of Soil by Impinging Jets of Gas with Applications to Landing Rockets on Planetary Surfaces,” in Proceedings of the 18th Engineering Mechanics Division Conference 2007, Blacksburg, VA, June 3-6, 2007.
Metzger, Philip T., “The Physics of Rocket Exhaust Cratering,” in Center Director’s Discretionary Fund 2005 Annual Report, NASA TP-2007-214731, pp. 47-64 (2007).
Metzger, Philip T., Christopher D. Immer, and Jannick Rolland, “Particle Ejection and Levitation Tracker (PELT).” In: John F. Kennedy Space Center’s Technology Development and Application 2006-2007 Report, NASA/TM-2008-214740, NASA, Kennedy Space Center, pp 30-31.
Metzger, Philip T., and Fesmire, James E., “Assessing the Mechanics of Granular Materials Undergoing Narrow-Cavity Shear in Gravity,” In: NASA/KSC Research & Technology Annual Report 2006, NASA-TM-2006-214201, pp. 82-83.
Helenbrook, Brian T., Hayley H. Shen, Michael P. Powers, and Philip T. Metzger, “Continuum modeling and discrete element simulations of elastic-quasi-static granular flow in a compressing slot,” in Proceedings of the Fifth World Congress of Particle Technology, Orlando, FL, April 2006.
Youngquist, Robert C., Philip T. Metzger, and John E. Lane, “Particle Beam Propulsion Using a Cluster of Electrostatic Conducting Spheres,” NASA New Technology Report 5020479 (2006).
Donahue, C.M., P.T. Metzger, and C.D. Immer, “Functional Scaling for the Cratering of a Granular Surface by an Impinging Jet,” in Proceedings of Earth & Space 2006, 10th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments, League City, Texas, Mar.5-8, 2006.
Metzger, P.T., C. Donahue, R. Haehnel, C. Immer, and B. Vu, “Rocket Exhaust Cratering: Transient Effects from Abrupt Application of Jet,” in Proceedings of Earth & Space 2006, 10th Biennial ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments, League City, Texas, Mar.5-8, 2006.
Metzger P, Donahue CM, Immer C. “Dynamical Scaling of Jet-Induced Crater Formation in a Granular Bed.” In: The Fifth World Congress of Particle Technology, Orlando, FL, April 24, 2006. https://aiche.confex.com/aiche/s06/techprogram/P37967.HTM.
Beaty, D.W., Snook, K., Allen, C.C., Eppler, D., Farrell, W.M., Heldmann, J., Metzger, P., Peach, L., Wagner, S.A., and Zeitlin, C., “An Analysis of the Precursor Measurements of Mars Needed to Reduce the Risk of the First Human Missions to Mars,” unpublished report of the Mars Exploration Program Analysis Group (MEPAG), http://mepag.jpl.nasa.gov/reports/index.html (2005).
Youngquist, Robert C., Philip T. Metzger, and Kelly Kilts, “Force Density Function Relationships in 2-D Granular Media,” SIAM Journal on Applied Mathematics 65(6), 1855-1869 (2005).
Metzger, Philip T., and Carly M. Donahue, “Elegance of disordered granular packings: a validation of Edwards’ hypothesis,” Physical Review Letters 94, 148001 (2005).
Donahue, Carly M., Philip T. Metzger, and Christopher D. Immer. “Empirical Scaling Laws of Rocket Exhaust Cratering.” 56th International Astronautical Congress, Fukuoka; Japan, Oct., 17-21, 2005.
Metzger, Philip T., John E. Lane, and Robert C. Youngquist, “Asymmetric Electrostatic Radiation Shielding for Spacecraft,” NASA Tech Briefs, 29 (9), p. 78 (September 2005).
Metzger, Philip T., and Bruce T. Vu, “Rocket Exhaust Cratering: Lessons Learned from Viking and Apollo,” report to NASA Exploration Systems Enterprise, RFI 04212004, (May 14, 2004).
R. Youngquist, P. Metzger, J. Lane, “Particle beam propulsion: simulations of an electrostatic sail concept,” Research and Technology 2004 Annual Report, John F. Kennedy Space Center, (2004) pp. 6–7.
Metzger, Philip T., “Granular contact force density of states and entropy in a modified Edwards ensemble,” Physical Review E 70, 051303 (2004).
Metzger, Philip T., “Comment on ‘Mechanical analog of temperature for the description of force distribution in static granular packings,'” Physical Review E 69, 053301 (2004).
Metzger, Philip T., John E. Lane, and Robert C. Youngquist, “Asymmetric Electrostatic Radiation Shielding for Spacecraft,” in Proceedings of the 2004 IEEE Aerospace Conference (Big Sky, MT), Mar. 6-13, 2004.A