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