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sbysky Scientists find evidence of missing neutron star from SN 1987A 网页链接 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

2019-11-26 15:53:23 通过网页   [评论]

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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