The key point to remember when considering the ...

[madam-professor]

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

[jazzlynnnnn]

Answer to Question 1

B

Answer to Question 2

A

[madam-professor]

Excellent

[cassie_ragen]

Gracias!