NASA Science Mission Directorate Planetary Science Division Director Jim Green (left) and NASA Headquarters Astrobiology Senior Scientist Mary Voytek discuss new findings on the moons of Jupiter and Saturn by NASAs Cassini mission researchers and the Hubble Space Telescope at the NASA Headquarters April 13, 2017 in Washington, DC.      (photo by Joel Kowsky /NASA  via Planetpix)
RMJ1FHTANASA Science Mission Directorate Planetary Science Division Director Jim Green (left) and NASA Headquarters Astrobiology Senior Scientist Mary Voytek discuss new findings on the moons of Jupiter and Saturn by NASAs Cassini mission researchers and the Hubble Space Telescope at the NASA Headquarters April 13, 2017 in Washington, DC. (photo by Joel Kowsky /NASA via Planetpix)
Director of Planetary Science Division in NASA's Science Mission Directorate Jim Green holds up a spoon to demonstrate how much water scientists thought to be on the moon during the NASA announcement of new science data about the presence of water on the moon collected during space missions in Washington September 24, 2009. Three separate missions examining the moon have found clear evidence of water there, apparently concentrated at the poles and possibly formed by the solar wind.  REUTERS/Larry Downing (UNITED STATES SCI TECH IMAGES OF THE DAY)
RM2E6TYMEDirector of Planetary Science Division in NASA's Science Mission Directorate Jim Green holds up a spoon to demonstrate how much water scientists thought to be on the moon during the NASA announcement of new science data about the presence of water on the moon collected during space missions in Washington September 24, 2009. Three separate missions examining the moon have found clear evidence of water there, apparently concentrated at the poles and possibly formed by the solar wind. REUTERS/Larry Downing (UNITED STATES SCI TECH IMAGES OF THE DAY)
NASA’s Director of Planetary Science Jim Green speaks during the Mars New Year's celebration Saturday, June 20, 2015, in Mars, Pennsylvania. The town is hosting three days of Science, Technology, Engineering, Arts and Mathematics (STEAM) activities. Photo Credit: (NASA/Bill Ingalls) Mars New Year's Celebration (201506200005HQ)
RMKRHF1MNASA’s Director of Planetary Science Jim Green speaks during the Mars New Year's celebration Saturday, June 20, 2015, in Mars, Pennsylvania. The town is hosting three days of Science, Technology, Engineering, Arts and Mathematics (STEAM) activities. Photo Credit: (NASA/Bill Ingalls) Mars New Year's Celebration (201506200005HQ)
Director of the Planetary Science Division at NASA Headquarters Jim Green talks about NASA’s journey to Mars and the film â€The Martian,†Tuesday, Aug. 18, 2015, at the United Artist Theater in La Cañada Flintridge, California. NASA scientists and engineers served as technical consultants on the film. The movie portrays a realistic view of the climate and topography of Mars, based on NASA data, and some of the challenges NASA faces as we prepare for human exploration of the Red Planet in the 2030s. (Photo by Bill Ingalls/NASA) *** Please Use Credit from Credit Field ***
RM2EX960NDirector of the Planetary Science Division at NASA Headquarters Jim Green talks about NASA’s journey to Mars and the film â€The Martian,†Tuesday, Aug. 18, 2015, at the United Artist Theater in La Cañada Flintridge, California. NASA scientists and engineers served as technical consultants on the film. The movie portrays a realistic view of the climate and topography of Mars, based on NASA data, and some of the challenges NASA faces as we prepare for human exploration of the Red Planet in the 2030s. (Photo by Bill Ingalls/NASA) *** Please Use Credit from Credit Field ***
Jim Green, director of Planetary Science at NASA Headquarters in Washington, attends the world premiere for 'The Martian” on day two of the Toronto International Film Festival at the Roy Thomson Hall, Friday, Sept. 11, 2015 in Toronto. NASA scientists and engineers served as technical consultants on the film. The movie portrays a realistic view of the climate and topography of Mars, based on NASA data, and some of the challenges NASA faces as we prepare for human exploration of the Red Planet in the 2030s. Photo Credit: (NASA/Bill Ingalls) 'The Martian' World Premiere (NHQ201509110002)
RMKRHHCJJim Green, director of Planetary Science at NASA Headquarters in Washington, attends the world premiere for 'The Martian” on day two of the Toronto International Film Festival at the Roy Thomson Hall, Friday, Sept. 11, 2015 in Toronto. NASA scientists and engineers served as technical consultants on the film. The movie portrays a realistic view of the climate and topography of Mars, based on NASA data, and some of the challenges NASA faces as we prepare for human exploration of the Red Planet in the 2030s. Photo Credit: (NASA/Bill Ingalls) 'The Martian' World Premiere (NHQ201509110002)
Juno team scientists celebrate after they received confirmation from the Juno spacecraft that it had successfully completed the engine burn and entered orbit of Jupiter, Monday, July 4, 2016 in mission control of the Space Flight Operations Facility at the Jet Propulsion Laboratory in Pasadena, California. The Juno mission launched August 5, 2011 and will orbit the planet for 20 months. From left to right: Dr. Jim Green, Planetary Science Division Director, NASA; Scott Bolton, Juno principal investigator, Southwest Research Institute; Geoff Yoder, acting Associate Administrator for the Science
RMW0KTXKJuno team scientists celebrate after they received confirmation from the Juno spacecraft that it had successfully completed the engine burn and entered orbit of Jupiter, Monday, July 4, 2016 in mission control of the Space Flight Operations Facility at the Jet Propulsion Laboratory in Pasadena, California. The Juno mission launched August 5, 2011 and will orbit the planet for 20 months. From left to right: Dr. Jim Green, Planetary Science Division Director, NASA; Scott Bolton, Juno principal investigator, Southwest Research Institute; Geoff Yoder, acting Associate Administrator for the Science
Panelists, from left, Jim Green, director, Planetary Science Division, NASA Headquarters, Washington, Carey Lisse, senior astrop
RME9TT56Panelists, from left, Jim Green, director, Planetary Science Division, NASA Headquarters, Washington, Carey Lisse, senior astrop
NASA Science Mission Directorate Planetary Science Division Director Jim Green (left) and NASA Headquarters Astrobiology Senior Scientist Mary Voytek discuss new findings on the moons of Jupiter and Saturn by NASAs Cassini mission researchers and the Hubble Space Telescope at the NASA Headquarters April 13, 2017 in Washington, DC.      (photo by Joel Kowsky /NASA  via Planetpix)
RMJ1FHT1NASA Science Mission Directorate Planetary Science Division Director Jim Green (left) and NASA Headquarters Astrobiology Senior Scientist Mary Voytek discuss new findings on the moons of Jupiter and Saturn by NASAs Cassini mission researchers and the Hubble Space Telescope at the NASA Headquarters April 13, 2017 in Washington, DC. (photo by Joel Kowsky /NASA via Planetpix)
Jim Green, Director of the Planetary Science Division, participates in a question and answer session about Mars and the soon to be released movie 'The Martian' staring Actor Matt Damon at the United Artist Theater August 19, 2015 in La Ca–ada Flintridge, California.
RMF0YJH2Jim Green, Director of the Planetary Science Division, participates in a question and answer session about Mars and the soon to be released movie 'The Martian' staring Actor Matt Damon at the United Artist Theater August 19, 2015 in La Ca–ada Flintridge, California.
NASA Astronaut Drew Feustel, left, Actor Matt Damon, Director Ridley Scott, Author Andy Weir, and Director of the Planetary Science Division at NASA Headquarters Jim Green, participate in a question and answer session about NASA’s journey to Mars and the film â€The Martian,' Tuesday, Aug. 18, 2015, at the United Artist Theater in La Cañada Flintridge, California. NASA scientists and engineers served as technical consultants on the film. The movie portrays a realistic view of the climate and topography of Mars, based on NASA data, and some of the challenges NASA faces as we prepare for huma
RM2EX9606NASA Astronaut Drew Feustel, left, Actor Matt Damon, Director Ridley Scott, Author Andy Weir, and Director of the Planetary Science Division at NASA Headquarters Jim Green, participate in a question and answer session about NASA’s journey to Mars and the film â€The Martian,' Tuesday, Aug. 18, 2015, at the United Artist Theater in La Cañada Flintridge, California. NASA scientists and engineers served as technical consultants on the film. The movie portrays a realistic view of the climate and topography of Mars, based on NASA data, and some of the challenges NASA faces as we prepare for huma
NASA Planetary Science Division Director Jim Green speaks during a press conference on the end of the Cassini-Huygens Saturn mission at the NASA Jet Propulsion Laboratory September 13, 2017 in Pasadena, California.  (photo by Joel Kowsky  via Planetpix)
RMKM8PHBNASA Planetary Science Division Director Jim Green speaks during a press conference on the end of the Cassini-Huygens Saturn mission at the NASA Jet Propulsion Laboratory September 13, 2017 in Pasadena, California. (photo by Joel Kowsky via Planetpix)
Chiwetel Ejiofor, actor, 'The Martian,' left, and Jim Green, director of Planetary Science at the NASA Headquarters chat Thursday, Oct. 1, 2015 at the Kennedy Space Center in Florida. The historic Vehicle Assembly Building is pictured in the bacground. NASA scientists, engineers and former astronauts as well as cast members from the movie 'The Martian' participated in a panel session focusing on the agency's Journey to Mars at NASA's Kennedy Space Center in Florida. (Photo by Red Huber/Orlando Sentinel/TNS) *** Please Use Credit from Credit Field ***
RM2EXBN39Chiwetel Ejiofor, actor, 'The Martian,' left, and Jim Green, director of Planetary Science at the NASA Headquarters chat Thursday, Oct. 1, 2015 at the Kennedy Space Center in Florida. The historic Vehicle Assembly Building is pictured in the bacground. NASA scientists, engineers and former astronauts as well as cast members from the movie 'The Martian' participated in a panel session focusing on the agency's Journey to Mars at NASA's Kennedy Space Center in Florida. (Photo by Red Huber/Orlando Sentinel/TNS) *** Please Use Credit from Credit Field ***