It wasn't until 1946 that humans first saw what the Earth looked like from space. These iconic images of our planet now include "Blue Marble," "Pale Blue Dot," and "Earthrise." The farthest is from ...
happened to collide with the Earth. The best-known episode is that in which the dinosaurs died 65 million years ago, but there have been many other catastrophic impacts both before then, and since.
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