Author Question: The key point to remember when considering the Hertzsprung-Russell (H-R) diagram of a star cluster ... (Read 67 times)

madam-professor · **on:** Jul 27, 2018

The key point to remember when considering the Hertzsprung-Russell (H-R) diagram of a star cluster in determining the evolution of stars is that all of the stars in the star cluster have the same:

A) temperature but differ in luminosity.
B) age but differ in mass.
C) size but differ in composition.
D) shape but differ in transparency.

Question 2

A star remains on the main sequence for a time span equal to _____ of its total existence as an energy-generating star.

A) 90 percent
B) 40 percent
C) 15 percent
D) 55 percent