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来自MSN
25 天
小行星为何长出彗星一样的尾巴?科学家:对彗星的判断可能有误
小行星和彗星,乍一看都是天上飞的,但仔细一瞅,区别老大了!小行星,你可以理解为一块大石头,主要成分是石头、碳或者金属,个头贼大,几百公里直径都有! 彗星就不一样了,它可是个“冰雪美人”,主要成分是冰和尘土,所以江湖人称“脏雪球”。个头比小行星迷你多了 ...
BBC
11 个月
Geminids meteor shower set to dazzle December skies
Originating from the debris of asteroid 3200 Phaethon, it will showcase a dazzling array of meteors seemingly emanating from the Gemini constellation. They can be seen in the night sky in the ...
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