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Originally Posted by shakran
no, it's determined by mass. the nebulas aren't really all that massive - any more than a cloud is massive. There's a LOT of space between the matter in a nebula.
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Meaning that it's less dense. Density = Mass/Volume.
I'm pretty sure that gravity is not just a factor of mass, but also of the volume of that mass. But I'm only basing this on my reasoning, which is certainly not flawless, so feel free to find a formula to prove me wrong, or just say I'm wrong, either way works.
Oh, and by the way, nebula are pretty massive, stars form in them, from the gasses collapsing in until enough pressure is formed to start fussion.