Dr. Jonathan Lunine, Director, Cornell Center for Astrophysics and Planetary Science, Co-Chair of the Former Committee on Human Spaceflight, National Academies of Sciences, Engineering, and Medicine testifies during the House Subcommittee on Space and Aeronautics hearing titled "Keeping our sights on Mars: A Review of NASA's Deep Space Exploration Programs and Lunar Proposal", Wednesday, May 8, 2019 at the Rayburn House Office Building in Washington. Photo Credit: (NASA/Bill Ingalls)

Dr. Jonathan Lunine, Director, Cornell Center for Astrophysics and Planetary Science, Co-Chair of the Former Committee on Human Spaceflight, National Academies of Sciences, Engineering, and Medicine testifies during the House Subcommittee on Space and Aeronautics hearing titled "Keeping our sights on Mars: A Review of NASA's Deep Space Exploration Programs and Lunar Proposal", Wednesday, May 8, 2019 at the Rayburn House Office Building in Washington. Photo Credit: (NASA/Bill Ingalls)

Cassini interdisciplinary Titan scientist at Cornell University, Jonathan Lunine, speaks to NASA Social attendees about the Cassini mission, Thursday, Sept. 14, 2017 at NASA's Jet Propulsion Laboratory in Pasadena, California. Since its arrival in 2004, the Cassini-Huygens mission has been a discovery machine, revolutionizing our knowledge of the Saturn system and captivating us with data and images never before obtained with such detail and clarity. On Sept. 15, 2017, operators will deliberately plunge the spacecraft into Saturn, as Cassini gathered science until the end. The “plunge” ensures Saturn’s moons will remain pristine for future exploration. During Cassini’s final days, mission team members from all around the world gathered at NASA’s Jet Propulsion Laboratory, Pasadena, California, to celebrate the achievements of this historic mission. Photo Credit: (NASA/Joel Kowsky)

NASA Associate Administrator, Human Exploration and Operations William Gerstenmaier, left, NASA Special Assistant to the Administrator Mark Sirangelo, Director, Cornell Center for Astrophysics and Planetary Science, Co-Chair of the Former Committee on Human Spaceflight, National Academies of Sciences, Engineering, and Medicine Dr. Jonathan Lunine, Chair, Aerospace Safety Advisory Panel Dr. Patricia Sanders, and, President, Faulconer Consulting Group, LLC Mr. Walt Faulconer, right, are seen during a House Subcommittee on Space and Aeronautics hearing titled "Keeping our sights on Mars: A Review of NASA's Deep Space Exploration Programs and Lunar Proposal", Wednesday, May 8, 2019 at the Rayburn House Office Building in Washington. Photo Credit: (NASA/Bill Ingalls)

Cassini project scientist at JPL, Linda Spilker, left, Cassini interdisciplinary Titan scientist at Cornell University, Jonathan Lunine, second from left, Cassini Composite Infrared Spectrometer(CIRS) Instrument deputy principle investigator Connor Nixon, second from right, and Cassini assistant project science systems engineer Morgan Cable, right, participate in a Cassini science panel discussion during the Cassini NASA Social, Thursday, Sept. 14, 2017 at NASA's Jet Propulsion Laboratory in Pasadena, California. Since its arrival in 2004, the Cassini-Huygens mission has been a discovery machine, revolutionizing our knowledge of the Saturn system and captivating us with data and images never before obtained with such detail and clarity. On Sept. 15, 2017, operators will deliberately plunge the spacecraft into Saturn, as Cassini gathered science until the end. The “plunge” ensures Saturn’s moons will remain pristine for future exploration. During Cassini’s final days, mission team members from all around the world gathered at NASA’s Jet Propulsion Laboratory, Pasadena, California, to celebrate the achievements of this historic mission. Photo Credit: (NASA/Joel Kowsky)

NASA Social attendees are seen during a science panel discussion with Cassini project scientist at JPL, Linda Spilker, Cassini interdisciplinary Titan scientist at Cornell University, Jonathan Lunine, Cassini Composite Infrared Spectrometer(CIRS) Instrument deputy principle investigator Connor Nixon, and Cassini assistant project science systems engineer Morgan Cable, Thursday, Sept. 14, 2017 at NASA's Jet Propulsion Laboratory in Pasadena, California. Since its arrival in 2004, the Cassini-Huygens mission has been a discovery machine, revolutionizing our knowledge of the Saturn system and captivating us with data and images never before obtained with such detail and clarity. On Sept. 15, 2017, operators will deliberately plunge the spacecraft into Saturn, as Cassini gathered science until the end. The “plunge” ensures Saturn’s moons will remain pristine for future exploration. During Cassini’s final days, mission team members from all around the world gathered at NASA’s Jet Propulsion Laboratory, Pasadena, California, to celebrate the achievements of this historic mission. Photo Credit: (NASA/Joel Kowsky)