The Remains of a Star
星星的遗迹
What is a black hole,anyway? Oh,come on,everyone knows what a black hole is.
黑洞是什么？拜托，大家都知道黑洞。
Do they? Everybody thinks they know because of science fiction.
他们真的知道吗？大家都只是通过科幻小说知道黑洞的。
But where do they really come from?
但是黑洞到底是怎么来的呢？
They come from stars.
黑洞是由恒星形成的。
A black hole is what you get when a really big star uses up all its fuel.
当一颗大的恒星燃料耗尽黑洞就产生了。
Gravity is always trying to push all the stuff that makes up a star into its center.
由于地心引力的作用，组成恒星的所有物质被压缩到核心位置。
But as long as the star has enough nuclear fuel in its core to keep burning,
但是，只要恒星的核心有足够的核燃料一直燃烧，
it pushes back. It's only when it runs out of fuel that
就会往外推。只有等燃料耗尽，
everything gets crushed down into the middle of the star.
所有物质才会向中心坍塌。
If the star is big enough, gravity just keeps squeezing and squeezing
如果这颗恒星足够大，地心引力会不断挤压
until everything that made up the star is compressed into a tiny point.
直到所有物质被压缩成一个密实的星体。
And get this—the gravitational attraction of that tiny point will be
得明白这一点：这个小星体的引力非常大，
so strong anything that comes too close will be sucked in, never to return!
任何靠近它的物质都会被吸进去，永远也出不来。
Not even light can escape. Even a passing beam of light will be pulled right in.
甚至连光都不能逃脱。一束经过的光线也会被吸入。