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cougarScientists find evidence of missing neutron star from SN 1987A https://www.sciencedaily.com/releases/2019/11/191119105545.htm ApJ.886.51 Since nobody could find it, different reasons were advanced for why it wasn't there. Some wondered if SN 1987A formed a quark star instead of a neutron star. Another theory suggested that a pulsar was formed instead, and that its magnetic field was small or unusual, preventing us from detecting it. A third possibility was that gas and dust fell back into the neutron star, collapsing it into a black hole. A more prosaic explanation was that it was there, just obscured by so much gas and dust that we can't see it. 现在最后一种解释可能更靠谱了

[评论]   2019-11-26 15:53:23 通过网页

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那年今日 That Today

cougar儿子学数字,说1是筷子,0是鸡蛋。然后看10,教说筷子夹鸡蛋,回答:筷子掉了一根

◎ 2014-11-26 22:20:24

cougar第一次听说微课,很有发展潜力

◎ 2014-11-26 22:14:17

给点阳光就灿烂,赛过活神仙 ~O~ 摄于奈良公園内猿沢池。猿沢池在五重塔附近,是兴福寺的放生池。池水倒映出五重塔的婀娜身影,是奈良八景之一。

◎ 2010-11-26 16:53:32

洗手池,摄于奈良公園内南円堂旁。在进堂祈愿参拜之前,都要先用此池水净手。

◎ 2010-11-26 16:46:34

興福寺的五重塔,摄于奈良公園内。塔高约50米,是仅次于京都东寺五重塔的日本第二高古塔,是古都奈良的象征之一。塔建造后曾6次遭火灾烧毁,被指定为国宝的现在的五重塔是公元1426年重新建造的。塔旁边是东金堂。今年正值兴福寺创建1300周年,五重塔首层和东金堂后堂的国宝正特別公开展示。

◎ 2010-11-26 16:43:26

cougar一个发布北京大学讲座及活动信息的Google日历: 网页链接

◎ 2009-11-26 23:31:52