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天文随心听|讲述宇宙与人的故事

银河系的银盘为什么是翘曲的?

24 Mar 2020

Description

多年以来,天文学家一直想弄明白我们的银河系(Milky Way)为什么是翘曲状的。来自欧洲空间局(European Space Agency,ESA)的巡天观测卫星盖亚(Gaia)的数据表明,这种扭曲可能源于另一个较小星系的碰撞,并且这一碰撞正在进行,碰撞产生的冲击通过银盘(galactic disc)传播到银河系边缘,就像往水中扔进石块会荡起涟漪一样。

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