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10 incredible images of black holes

Feb. 21, 2011, 12:20 p.m.
swirling gas, stars in space

Photo: NASA E/PO, Sonoma State University, Aurore Simonnet

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Pulling from a star

This artist’s rendering shows a black hole pulling gas away from a nearby star. A black hole is black because its gravitational pull is so dense that it traps light. They are invisible, which is why researchers rely on their evidence to determine their existence. NASA points out that black holes can be as small as one atom or as large as a billion of our suns.