Earthrise

When it comes to famous images of space, Earthrise is easily in the top ten, but it's hard for this beautiful picture to lose its impact. Taken by Bill Anders on the Apollo 8 mission, just a year before Apollo 11 landed on the moon, this photo has been called the "most influential environmental photo ever taken." The switch in perspective, watching the earth rise the way we'd watch the sun, certainly caught the astronauts by surprise (you can actually listen to them as they first see the earth floating outside their window, and even watch a simulation of the event!)