It's Earth Day

And since this is a day for doing things to keep the planet healthy, here's an iconic view:

Earth, in a photo taken by Apollo 17 astronauts in 1972. i i

hide captionEarth, in a photo taken by Apollo 17 astronauts in 1972.

U.S. National Archives
Earth, in a photo taken by Apollo 17 astronauts in 1972.

Earth, in a photo taken by Apollo 17 astronauts in 1972.

U.S. National Archives

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