Retro NASA Travel Posters Invite You to Real Alien Worlds
These amazingly retro NASA travel posters
feature three real-life alien planets: Kepler 186f, HD 40307g and
Kepler 16b. They were created for NASA's PlanetQuest project at the
agency's Jet Propulsion Laboratory in Pasadena, California to share
facts about the strange new worlds with the public.
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