"We came all this way to explore the moon, and the most important thing is that we discovered the Earth."
-- astronaut Bill Anders
At one point in Apollo 8's lunar orbit, the Earth came into view over the moon's horizon. The crew reacted with astonishment to the beautiful sight, snapping photographs and expressing their excitement.
These images would become some of the century's most famous, inspiring people worldwide to consider Earth's place in the cosmos.
Browse a gallery of Earth photographs from Apollo 8.
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