What Are the Main General Features That Make Clusters of Stars

question 164

Multiple Choice

What are the main general features that make clusters of stars useful to astronomers?

• A) The stars all have the same apparent magnitude, the same surface temperatures, and the same sizes.
• 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 intrinsic brightness but differ in size and surface temperature.
• D) The stars are at the same distance from Earth, were formed at approximately the same time, and were made from the same chemical mix.

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