A Complete Collection of 100000 Whys
Fav十万个为什么
为什么说太空云雾就是星云？
太空云雾被称为星云，是因为它们本质上都是由气体和尘埃组成的星际云，其形态和成分与星云的定义完全一致。
1、本质相同：太空云雾和星云本质上都是由稀薄的气体和尘埃组成的星际云，成分以氢和氦为主，符合星云的定义。
2、形态相似：太空云雾呈现云雾状外观，与星云的弥漫或规则形态相似，且星云的体积庞大，可达几十光年，与太空云雾的特征一致。
3、演化关系：星云是恒星形成的基础，太空云雾中的物质在引力作用下可能收缩形成恒星，而恒星演化后也会抛射物质形成新的星云。
总结：太空云雾被称为星云，是因为它们本质上都是由气体和尘埃组成的星际云，其形态和成分与星云的定义完全一致。
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