Explain how astronomers determine composition,, Ask an Expert

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Explain how astronomers determine composition, temperature, speed, and rotation rate of distant objects.
o Explain the properties of stars in the H-R diagram located in Ch. 15, "What is a Hertzsprung-Russell diagram?" of The Cosmic Perspective.
o Summarize the complete lifecycle of the Sun.
o Determine where the Sun is in its lifecycle.

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