On April 12, 1961, the Soviet cosmonaut Yuri Gagarin became the first human to see Earth from space. "The sky is very dark," he said of the view; "the Earth is bluish. Everything is seen very clearly." On March 28, 2012, the International Space Station captured this image of Gagarin's home, Russia, at night -- and from 240 miles above its surface. That's one of the station's solar panels on the left of the image. And the explosion of light on the Earth's surface? Moscow.
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