Space may look calm and empty from down here, but when you see everything moving around up there, it's actually pretty crowded.

NASA's NEOWISE program, which measures asteroids and meteors that come near Earth, underwent a reset at the very end of 2013 — which means the data show a pretty good view of how much asteroid activity we get in a given year. The very closest of the asteroids (the Near Earth Objects) are represented in green, the other asteroids in white, and a smattering of comets can be seen as yellow dots.

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