| 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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