Today is the 40th anniversary of the Apollo 17 launch, the last manned mission to the moon. Most of the time, we think of those missions as directed outward, an exploration of space, a thrilling chance to get closer to the vast rest of the solar system. But the photos the astronauts took looking back toward Earth are informative, too. Now, NASA has released new photos of the Earth at night, taken by the Suomi NPP satellite.
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