What is a black hole?
The Hungriest Monster
What is a black hole?
Imagine a place in space so greedy, so impossibly heavy, that it swallows everything — light, stars, planets, even time itself. Nothing that falls in ever comes back out. That's a black hole: the universe's hungriest monster.
Black holes form when giant stars die. A star twenty times heavier than our Sun burns through all its fuel, then collapses in on itself in seconds. All that star-stuff — millions of Earths' worth of mass — gets crushed into a space smaller than a city.
