1.The main sequence of an H-R diagrams is the arrangement of stars in the diagram.
2.90 precent of stars are mian sequence stars.
3.Yes the Sun is a main sequence star.
4. The next thing that will happen to the sun is that is will become a redgiant.
5. The picture to the left shows an H-R diagram. As you can see the sun is aprt of the main sequence. This Graph shows you the relationship between absolute magnitude and temperature of a star.
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