In honor of Earth Day, a piece of Trivia. The picture to the left here is nicknamed "The Blue Marble," and is a photograph taken on the Apollo 17 mission in 1972. (the last manned mission to the moon.)
It is, essentially, the only full picture of the whole globe ever taken, without having part of the planet in shadow, or needing computers to fill in the gaps.
Here's where this gets fun. The image is easy to spot, since it has that distinctive arrowhead shaped cloud hanging right over the horn of Africa. So, here's the game: every time you see an image of the Earth - in movies, magazine ads, computer games, science articles, whatever - take a look for that arrowhead. Odds are, it'll be there. After a while, this kinda turns into "Where's Waldo" for space buffs - pretty much every picture of the earth is THIS PICTURE. How cool is that?
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