"What are three methods we are using to detect other planets outside of our solar system?"
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Question
Why are O and B stars the brightest in open clusters, and why are red giants the brightest stars in globular clusters?
This question is not really on astrobiology, so I will provide only a brief answer. O and B stars are very young and bright, and they have short lifetimes, so we see them only in very young groups of stars such as open clusters. Globular clusters are very old, and any O or B stars that were once there have evolved into red stars. For more details on stellar evolution you should probably consult an astronomy book.
David Morrison
NAI Senior Scientist
March 23, 2004
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