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Black Holes Encyclopedia
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FAQ

How can a black hole's own gravity, but not light, escape from it?

In the case of a black hole, it's best to think of gravity as Albert Einstein described it: a warp in space-time. Einstein's theory of special relativity says that mass warps the space around it. For relatively lightweight bodies, like Earth, the effect is tiny. For heavier objects, like the Sun, the effect is small but detectable. (Scientists confirmed the effect, among other ways, by measuring the orbit of Mercury, the closest planet to the Sun, which is dragged forward a bit by the Sun's distortion of space-time.) And for the most massive objects, like black holes, the effect is enormous. Diagrams in astronomy textbooks often depict black holes as deep "wells" in space-time, with matter funneling into the black hole like pebbles dropped into a water well on Earth. So nothing has to "escape" from the black hole for it to exert a gravitational influence on the matter and space around it.

Other FAQs

What is a black hole?

Do black holes really exist?

Are any black holes close to Earth?

Will our Sun become a black hole?

What is the biggest black hole?

What happens when you get close to a black hole?

How does a black hole form?

Are black holes 'doorways' to other parts of the universe?

Can anything ever escape from a black hole?

How many black holes are there?

Where did the name 'black hole' come from?

How are black holes named?

Will our universe become a black hole?

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