英语听力：自然百科 穿越银河系的旅行 Through Milky Way—8
时间：2014-05-27 06:35:08
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（单词翻译）
Like nebulae which spawn2 stars, it is made of gas and dust. But that's where most similarities end. For Alex Filippenko, it represents an intriguing3 industrial zone within our galaxy4 where the elements from which our world is made or manufactured.
What about more iron. Oh,
The
Crab5 Nebula1 is a fascinating object. We see/ very rapidly expanding gases. The Crab may appear static, but its gases are
racing6 out from its center at over 3 million miles an hour, blasted out by a phenomenally powerful event in the past.
What could cause such violence?
When we examine the gases of the Crab Nebula which are expanding outward, and we extrapolate that expansion backward in time, we find that all the gases were at a common point about 1000 years ago.
A thousand years ago on earth, there were civilizations watching the heavens. In 1054 AD, Chinese manuscripts tell of the sudden arrival of a brilliant new star which are brighter than any other star. So brightly, it was visible during the day. Then it mysteriously disappeared.
Today the Crab Nebula appears in exactly the same part of the sky where the Chinese observed their brilliant star. What they witnessed was the moment the Crab was born. The Crab Nebula was produced by the
colossal7 titanic8 explosion of the star at the end of its life. It is a supernova remnant.
The spiral arms of our
Milky9 Way elated with these colorful remnants, tombstones of stars that died violently in cataclysmic explosions
astronomers10 call supernovae.
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