Question

Wich statement is true?

A) most stars are main sequence
B) very few stars are main sequence stars
C) no stars have made it to the main sequence
D) all stars have made it to the main sequence

Answer 1

Most stars are main sequence stars as they spend about 90% of their lifetimes in this phase, which is confirmed by H-R diagram observations.

A is correct

Step-by-step explanation:

The correct statement regarding the main sequence stars is: A) most stars are main sequence stars. Astronomical data confirms that about 90% of the stars observed in the sky are on the main sequence of an H-R diagram, which makes sense considering that stars spend the majority of their life in this phase, undergoing hydrogen fusion.

This is evidenced by the fact that stars are found in various spectral types ranging from O (most massive and most luminous) to M or L (least massive and least luminous) all aligned along the main sequence, representing different stellar masses.

Answer 2

The best answer is A.
About 90% of stars are main sequence.