Question

SPACE! What is a main sequence star? What event causes a star to leave the main sequence?

Answer 1

Step-by-step explanation:

The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness.

Answer 2

a main sequence star burns through the hydrogen in its core, reaching the end of its life cycle. At this point, it leaves the main sequence. Stars smaller than a quarter the mass of the sun collapse directly into white dwarfs. When stars run out of hydrogen, they begin to fuse helium in their cores. This is when they leave the main sequence. High-mass stars become red supergiants, and then evolve to become blue supergiants. It's fusing helium into carbon and oxygen.