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Black Holes 101 | National Geographic
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(mysterious music)
- [Woman] Black holes are among
the most fascinating objects in our universe,
and also the most mysterious.
A black hole is a region in space
where the force of gravity is so strong,
not even light, the fastest known entity
in our universe, can escape.
The boundary of a black hole is called the event horizon,
a point of no return, beyond which we truly cannot see.
When something crosses the event horizon,
it collapses into the black hole's singularity,
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