What kind of nebulae can get into stars?i mean nebulae such as dark ones or etc.thanks?

Question

What kind of nebulae can get into stars?i mean nebulae such as dark ones or etc.thanks?

Answer 1

Actually it is dark nebulae that will contract to form stars.

Basically you need the gas to be cool. If nebulae have lots of dust, light doesn't penetrate well so they stay cool inside. Also, because of the way dust emits (a continuum) as opposed to gas (discrete energies) it is easier for the nebula to keep cooling.

The issue is the balance of gravity and pressure. As gas heats up the pressure goes up and it starts to counteract gravity. But if it starts out cool and has a way to continuous lose energy, the pressure will stay low enough for gravity to win, and it contracts to make a star.

Answer 2

Curiously, you need to have a nebula that can cool and contract, so that it can get dense and hot to form stars.  A thick, dense dark nebula may not be able to do that.

The great Orion nebula is certainly a star forming factory.

Answer 3

Nebulae are much larger than stars, stars can be in a nebula, but not the other way around.  Some nebulae contract to form stars, maybe in that sense?