Answer :
protostar
Then main phase so there are two possibilities:
1. Average size star (size of the sun)
Undergoes main phase, then becomes a red giant, then planetary nebula, then white dwarf.
2. Massive star
Undergoes main phase, then red supergiant, then supernova (star implodes) then the star becomes a neutron star OR if it was REALLY big a black hole.
Then main phase so there are two possibilities:
1. Average size star (size of the sun)
Undergoes main phase, then becomes a red giant, then planetary nebula, then white dwarf.
2. Massive star
Undergoes main phase, then red supergiant, then supernova (star implodes) then the star becomes a neutron star OR if it was REALLY big a black hole.
1. red giant 1. a star whose outer shell has expanded an cooled
2.super nova 2. a shock wave produce by extremely high temperature
3. black hole 3. a high-mass star that has collapsed from gravity
4. white dwarf 4. a low-mass star that has shed it's outer layers
is correct answer