The largest types of clouds found in interstellar space are

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Quizplus · Accepted Answer

Molecular clouds with supplies of dust and molecules are the largest types of clouds found in interstellar space, with masses ranging from tens of thousands to millions of solar masses and sizes ranging from a few to hundreds of light years. HI regions and HII regions are smaller and contain neutral and ionized hydrogen, respectively. Interstellar grains are even smaller, typically only a few nanometers in size.

The Largest Types of Clouds Found in Interstellar Space Are