The accretion of matter due to gravity.
planetary
Main-sequence,red giant,white dwarf.
A Planetary Nebula. See related question.
The sun is a main sequence star
Most of the stars in the universe are found on the main sequence. Stars fall off the main sequence when they begin to die.
The Main Sequence
Protostar formation - The Birth of a starMain sequence - When it converts hydrogen into energyPost main Sequence - When they die.
planetary
A red main sequence star would be a red dwarf or a branch red giant. To be on the main sequence, you have to have hydrogen nuclear fusion.
A Planetary Nebula. See related question.
Main-sequence,red giant,white dwarf.
A Planetary Nebula. See related question.
Main Sequence
The sun is a main sequence star
its to the right of the middle of the main sequence.
There are billions of stars that are not on the main sequence.
No. They have the lowest temperatures on the main sequence. The hottest main sequence stars are blue.