a planetary nebula forms after a hsb o3iii
protostar or nebula
Emission nebula glow and reflection nebula reflect the light form other stars
If the nebula is gravitationally unstable, it collapsing & forming stars!
A nebula may condense and ignite to become a star, conversely a star may explode and form a nebula.
Dust and particles.
Planetary nebula is a misnomer because it's totally irrelevant to planets and it has something to do with stars. The short form is "nebula".
An explosion from outside the nebula
When a nebula is disturbed by an outside explosion, it may form an accretion disc.
Stars form from the matter within nebula.
The nebula forms into a protostar.
no, it formed from a nebula, then condensed
A nebula.