David Grinspoon, senior scientist at the Planetary Science Institute discusses Pluto and the Human Imagination, Monday, Dec. 31, 2018 at Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. Photo Credit: (NASA/Bill Ingalls)
David Grinspoon, senior scientist at the Planetary Science Institute discusses Pluto and the Human Imagination, Monday, Dec. 31, 2018 at Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. Photo Credit: (NASA/Bill Ingalls)