Reflection nebulas are actually made up of very fine dust that normally appears dark but can look quite blue when reflecting the light of energetic nearby stars. 反射星云事實(shí)上是由非常纖細的塵埃構成的，這類(lèi)塵埃云通?？雌饋?lái)很暗，但當它反射鄰近的活力四射的恒星星光時(shí)，它看起來(lái)就會(huì )非常藍。
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