Most of its active life, usually. The actual time may vary from only a few million years (for very massive stars) to trillions of years (for some red dwarves).
yes
the red giant phase is about the end of a stars life. it will last for about one million years.
See related link for a full list of stars in Delphinus
Beacuse they are dimmer, but they're also bigger than the main sequence stars.
above the main-sequence stars
main sequece
what are the mai sequence of stars
main sequence stars
Main sequence
Its not... the main thing it does is suppord life which other stars can possibly do, too.
After the main sequence, a star becomes a red giant.
The main sequence.
A main sequence does not do anything - it is just a name for a period in a stars life. [See related question]
All stars that are converting hydrogen into helium via nuclear fusion are said to be on "main-sequence". See related question for more information
See related question
Yes Star spend most of their life span as a main sequence star. A star end will depend on its size in life the end of a start can be a red giant to supernova, a white dwarf, pulsar, or black hole.
Understand that the Main Sequence is not a place or a category that a star belongs to all its life. A star's destiny is controlled by its size and this determines how much time it spends on the Main Sequence.