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新型超新星获证实解开上千年的恒星之谜 | 蟹状星云 | 电子俘获

所谓超新星，就是一颗恒星以爆炸的方式终结寿命的过程。迄今为止科学家熟悉的超新星有两种类型，热核爆炸（thermonuclear）和铁芯坍塌（iron-core collapse）。热核超新星是双星系统内的一颗白矮星吸收了其伴星的物质后发生的爆炸。白矮星是质量在太阳8倍以下的恒星到了寿命的终点后所留下的高密度内核。新发现的超新星介于这两种类型之间，名为电子俘获（electron capture）超新星。这类恒星比变成白矮星的恒星质量大一些，可以不断进行核聚变产生越来越重的元素，直到内核含有氧、氖和镁等元素；但是它的质量又不够大，无法继续启动下一级可以产生铁元素的核聚变反应，因此不会成为铁芯坍塌的超新星。其实，恒星的引力一直要压垮恒星，是内部不断进行的各级核聚变反应让恒星的生命继续，或是内部的原子已经被压缩到一定程度无�

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北大清华世界大学排行榜名次稳中有升_孔孟之乡

北大清华世界大学排行榜名次稳中有升_孔孟之乡
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台军"总长"明天卸任蔡英文罕见地一口气换军中3巨头|国防部

台军"总长"明天卸任蔡英文罕见地一口气换军中3巨头|国防部
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미래양자융합포럼 출범…"실험실에서 산업 현장으로"

미래양자융합포럼 출범…"실험실에서 산업 현장으로"
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삼성ㆍLGㆍ현대차ㆍSK하이닉스, 양자기술 도약 위해 뭉쳤다

삼성ㆍLGㆍ현대차ㆍSK하이닉스, 양자기술 도약 위해 뭉쳤다
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15년간 몸에 기생충 기르며 연구… 日 후지타 교수 별세

15년간 몸에 기생충 기르며 연구… 日 후지타 교수 별세
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携手中科院、增热门专业......南工大释放多重"利好"吸引优秀高考考生_荔枝网新闻

携手中科院、增热门专业......南工大释放多重"利好"吸引优秀高考考生_荔枝网新闻
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携手中科院、增热门专业……南工大多重"利好"吸引优秀高考考生

携手中科院、增热门专业……南工大多重"利好"吸引优秀高考考生
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北京大学施柏鑫：从审稿人视角，谈谈怎么写一篇CVPR论文

北京大学施柏鑫：从审稿人视角，谈谈怎么写一篇CVPR论文
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美日间的肮脏交易被揭开美国为何不敢正面回应？-新闻中心-中国宁波网

美日间的肮脏交易被揭开美国为何不敢正面回应？-新闻中心-中国宁波网
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