What are the main general features that make clusters of stars useful to astronomers?
A) The stars are at the same distance from Earth,were formed at approximately the same time,and were made from the same chemical mix.
B) The stars are all at the same distance from Earth,have the same surface temperature,and joined the cluster at various times.
C) The stars all have the same apparent magnitude,the same surface temperatures,and the same sizes.
D) The stars all have the same intrinsic brightness but differ in size and surface temperature.

Question

Quizplus · Accepted Answer

Clusters of stars are useful to astronomers because the stars within a cluster are usually at the same distance from Earth, were formed at approximately the same time, and were made from the same chemical mix, making them useful for studying stellar evolution and the properties of stars.

What Are the Main General Features That Make Clusters of Stars