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Physics 17 Online
OpenStudy (anonymous):

4) Group 2 and Group 3 stars represent which stages of development? Describe these groups in terms of their relative age, size, brightness, and temperature. http://static.k12.com/eli/bb/1481/-1/0/1_125303_55002/-1/5e67b7676ac59f0c66d2ab99fcb89a442ebcefd7/media/64a74b85c16bfe9b892637c0016dd95878d21da6/277609.pdf

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