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河外星系
external galaxy
- M100是室女座中2500个河外星系（据估计）中的一个，该星系天文业余爱好者可观测。
M100 is a member of the huge Virgo cluster of an estimated 2,500 galaxies. - 照他的意思应该银河系的核心也是一个黑洞.离银河系最近的两个河外星系麦哲伦星云和仙女座大星云好像都有黑洞.
"Every galaxy contains a black hole, and there are millions or billions of galaxies. In principle, we are expecting these events to happen all the time," said Prof Hasinger. - 最令人惊奇的就是,少部分的流星还能以大约每小时700,000英里的脉冲速度运行.他们飞的如此快,很有可能来自于河外星系.
The biggest shock are the rare meteors clocked at almost seven hundred thousand miles an hour. These are flying so fast, they must come from outside our galaxy itself!
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