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2014-06-25
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2014-06-18
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2014-06-05
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2014-05-01
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2014-04-29
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2014-04-23
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2014-04-17
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2014-04-08
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2014-03-24
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2014-03-23
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2014-03-16
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2014-03-09
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2014-03-03
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2014-03-03
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2014-02-27
大質量恆星產生的超新星爆發最終會演化成中子星,直徑在20公里左右,其密度接近原子核密度,如果中子星超過其質量上限還將繼續坍縮,最終變成黑洞。
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2014-02-27
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2014-02-14
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2014-02-12
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2014-02-07
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2014-02-06