Question

1. Are the most bright stars near the main sequence? What about the nearby stars?

2. Which sample of stars do you think is more representative of "average" stars in the galaxy? Why?

Answer 1

Any star that is fusing hydrogen in its core and has a balance of outward pressure from core nuclear fusion and gravitational force is called main sequence star. Main sequence is continues and distinctive band of stars that appears on the plot of HR diagram.90% of the stars in the universe are main sequence stars. So the most bright stars are near main sequence and also ,near by stars like sun and alpha century are also included in main sequence.

Due to fact that 90% stars in the universe are main sequence stars so main sequence is more representative of average stars in the galaxy.