1. On an H-R Diagram, what is the main sequence?
The sequence is considered the hottest star to the coldest star.
2. What percentage of stars are main sequence stars?
Approximately 90% of all stars are main sequence stars.
3. Is the Sun a main sequence star?
Yes, the Sun is a main sequence star.
4. What will happen to the Sun next? When will this happen?
Eventually the Sun will become a Red-Giant, then go into a variable stage, then into the planetary nebula stage, then white dwarf stage, finishing at black dwarf stage. In about 4-5 billion years from now the Sun will become a red giant.
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