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河外星系

名词解释题
2022-10-01 07:20
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正确答案
河外星系指的是银河系之外的其他星系,它们都是与银河系属于同一量级的庞大恒星系统。河外星系一般用肉眼看不见,就是通过一般望远镜去观察,也还是一片雾,天文学家才发现二者完全是两码事:河外星云实际上是和我们银河系、类似的星系,而真正的“星云”,都是我介银河系的内部成员,是由恒星之间的稀薄气体和尘埃组成的。因此,现在再也不用“河外星云”这个词了,而一律改称“河外星系”。

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