What are black holes?
Astronomers can't see these mighty munchers of matter of matter, but they spot their effects all across the galaxy. Black holes form when stars 20 times larger than our own sun run out of fuel and go "supernova"-or explode. The dying star's core collapses under it's own gravity until it scrunches under it's own gravity until it scrunches into singularity-or tightly packed point smaller than an atom. Despite it's tiny size, the singularity still packs gravitational pull many times stronger than our sun. Like cosmic whirlpool, the black hole pulls in anything-asteroids, planets, other stars, and even light that gets too close.
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