Ron Kwok speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine, right, and Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, pose for a photo after Dr. Freilich was awarded the NASA Distinguished Service Medal at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Casey Youngflesh speaks during the press briefing, "Penguins from Space", Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Ben Smith speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Tom Neumann speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Michael Polito speaks during the press briefing, "Penguins from Space", Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Heather Lynch speaks during the press briefing, "Penguins from Space", Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Ron Kwok speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine awards Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, the NASA Distinguished Service Medal at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)