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B1 中级 英语 3:11 Educational

Black Holes 101 | National Geographic

National Geographic · 10,781,782 次观看 · 添加于 2 个月前

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字幕 (56 片段)

00:00

(mysterious music)

00:02

- [Woman] Black holes are among

00:03

the most fascinating objects in our universe,

00:06

and also the most mysterious.

00:13

A black hole is a region in space

00:15

where the force of gravity is so strong,

00:17

not even light, the fastest known entity

00:20

in our universe, can escape.

00:23

The boundary of a black hole is called the event horizon,

00:26

a point of no return, beyond which we truly cannot see.

00:31

When something crosses the event horizon,

00:33

it collapses into the black hole's singularity,

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