Gravity.
NEBULA
A nebula is what it is. :)
nebula
solar nebula
nebula
A protostar forms when gravity pulls the dust and gases in a nebula together.
NEBULA
clouds of dust and gas
A nebula IS a cloud of dust and gas loosely held together by gravity.
A nebula is what it is. :)
Gas and dust in a nebula is disturbed by an outside force
None. A nebula is a cloud of gas and dust that can contain young stars, but a nebula is not a planet by any means.
No, The nebula is an interstellar cloud of dust, hydrogen gas, helium gas and plasma. Look on Wikipedia.
As a nebula, a cloud of gas and dust.
Nebula
Nebula
A nebula.