| Starting
Ch.9: Interstellar Medium |
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| | Since stars die, new ones must somehow be born |
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| | They must be made out of material like star: |
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| | H, He, plus a little heavier elements |
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| | Three types of interstellar nebulae or clouds |
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| | Emission nebulae -- Glow
with emission lines |
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| | Reflection nebulae --
Reflect starlight |
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| | Dark nebulae -- seen in
silhouette |
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