Which of the following statements about open star clusters is true?
A. As open star clusters slowly condense, their residual rotation spins them into a flat pancake shape and they become spiral galaxies.
B. One star in an open cluster eventually undergoes a supernova explosion that quickly disperses the other stars.
C. The motions of individual stars are such that all open clusters eventually disperse.
D. Open star clusters slowly condense into globular clusters as the stars drive off the remaining interstellar dust and gas.
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A you know is untrue because open clusters have a few hundred stars, while spiral galaxies have billions.
B is untrue - supernovae are incredibly energetic events, but space is so big that they can't blast away other stars that are light-years away.
C is correct
D you know is untrue for the same reason as A - open clusters have hundreds of stars, globular clusters have hundreds of thousands of stars.
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It's C.
C.