In the context of the evidence on evolution of stars, you can estimate the _____ of a star cluster by observing the distribution of the points that represent its stars in the Hertzsprung-Russell (H-R) diagram.
A) age
B) density
C) composition
D) mass
Question 2
_____ was a type II supernova that was produced by the explosion of a hot, blue supergiant.
A) SN 1572
B) SN 1604
C) SN 1987A
D) SNR 1868