Physics, 13.12.2019 07:31, haha81

You observed three different star clusters and found that the main-sequence turnoff stars in cluster 1 had spectral type a, the main-sequence turnoff stars in cluster 2 had spectral type b, and the main-sequence turnoff stars in cluster 3 had spectral type g. which star cluster is the oldest?

a.) cluster 1
b.) it is impossible to determine their ages given only the spectral types
c.) cluster 2
d.) cluster 3

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You observed three different star clusters and found that the main-sequence turnoff stars in cluster...