largest cloud found???

Question

What are the largest types of clouds found in interstellar space?

molecular clouds with supplies of dust and molecules

interstellar grains


all these clouds are approximately the same size

HII regions -- clouds of ionized hydrogen

HI regions -- clouds of neutral hydrogen

Answer 1

Hi. There are vast numbers of star forming regions which consist of 'clouds' of something. The problem is even the densest of these is a hard vacuum compared to any area on Earth. Neutral hydrogen far outweighs ionized hydrogen. So I'll say HI clouds.