Jim Green
The Department of Energy's Oak Ridge National Laboratory in Tennessee has begun producing plutonium-238, but full-scale production of the spacecraft fuel isn't expected until 2023 at the earliest. Credit: Oak Ridge National Laboratory
JWST Program Scientist John Mather speaking at NASA Headquarters event in 2014 in front of an animation of the 6.5-meter infrared telescope. Photo Credit: NASA/Joel Kowsky
NASA's Jim Green, director of planetary science. Credit: NASA/Aubrey Gemignani
Plutonium-238 pellet
John Grunsfeld speaking at a July 24 conference about recent Pluto discoveries. Credit: NASA
Credit: NASA, Bill Ingalls
Artist's concept of ESA's Jupiter Icy Moons, or Juice, mission. Credit: Airbus
Alan Stern's coffee cup. Stern is the principle investigator for NASA's New Horizons mission, which launched in 2006 en route to a historic 2015 Pluto flyby. Credit: Alan Stern
Io, as seen from the Galileo probe. Credit: NASA/JPL
Jim Green, NASA's P Planetary Science Division director (center) NASA, speaks on a panel about the instruments selected to investigate Jupiter's moon, Europa. Credit: NASA/Aubrey Gemignani
Concept art for Northrop Grumman's proposed Venus airplane, the Venus Atmopsheric Maneuverable  Platform (VAMP). Credit: Northrop Grumman
An artist's concept of Europa's "Great Lake." Credit: Britney Schmidt/Dead Pixel VFX/University of Texas at Austin.

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