Jisho

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せいかんうん 星間雲
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Noun
1. interstellar cloud​
Wikipedia definition
2. Interstellar cloud​Interstellar cloud is the generic name given to an accumulation of gas, plasma and dust in our and other galaxies. Put differently, an interstellar cloud is a denser-than-average region of the interstellar medium. Depending on the density, size and temperature of a given cloud, the hydrogen in it can be neutral, ionized (i.e. a plasma), or molecular. Neutral and ionized clouds are sometimes also called diffuse clouds, while molecular clouds are sometimes also referred to as dense clouds.
Read “Interstellar cloud” on English Wikipedia
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