Frequently Asked Questions
What is the Schwarzschild radius?
It is the radius at which an object would have to be compressed for its escape velocity to equal the speed of light. Inside this radius not even light can escape, which defines the event horizon of a black hole.
How big would Earth be as a black hole?
If the entire Earth were crushed within its Schwarzschild radius, it would shrink to a sphere only about nine millimeters across. The Sun would need to collapse to a radius of roughly three kilometers.
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