H-R Diagram

This diagram show the main star sequence. From the left(blue) is the hottest and to the right (red) is the coolest. Off from the sequence there are the Red Giants. Those are just very large, bright, cool stars. There is also the white dwarfs. Those stars are small and normally the towards end of the star's evolution.

1. On an H-R Diagram, what is the main sequence?

The main sequence on an H-R Diagram is the hottest to coldest from left t right.

2. What percentage of stars are main sequence stars?

90%

3. Is the Sun a main sequence star?

Yes

4. What will happen to the Sun next? When will this happen?

Evidence shows that the Sun will grow dramatically and engulf the Earth before it dies out.