When a black hole forms, it’s usually because a massive star runs out of fuel. Without the energy from burning fuel to hold it up, the star collapses under its own gravity. All of its mass gets squished into a tiny point called a *singularity*, where gravity becomes so strong that nothing—not even light—can escape. This creates the “black hole.”
Around the black hole is something called the *event horizon*. It’s like a point of no return—once something crosses it, it’s sucked into the black hole and can’t get out. Black holes keep growing as they pull in more matter, but we can’t see inside them because light can’t escape.
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