The accretion of matter due to gravity.
planetary
The sun's life cycle includes the stages of formation, main-sequence, red giant, and white dwarf. It is currently in the main-sequence stage, where it fuses hydrogen into helium in its core. Eventually, it will expand into a red giant before shedding its outer layers and becoming a white dwarf.
Main sequence stars are bigger.
Depending on how "low" on the chart it will either be a red dwarf or a PMS (Pre-main sequence) star.
Red Giants - although they can be branch main sequence for a while.Brown DwarfsBlack dwarfsWhite dwarfsT-Tauri starsProtostarsNeutron starsPre-main sequence stars (PMS stars)
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
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.
The sun's life cycle includes the stages of formation, main-sequence, red giant, and white dwarf. It is currently in the main-sequence stage, where it fuses hydrogen into helium in its core. Eventually, it will expand into a red giant before shedding its outer layers and becoming a white dwarf.
The temperature of main sequence stars can vary quite a bit.
Off the Main Sequence was created in 2005-11.
Off the Main Sequence has 738 pages.