a1c40 - Astronomy 1 Last news report due on Dead Day, Dec....

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Astronomy 1 I Last news report due on Dead Day, Dec. 14. I Final Exam: Thursday Dec. 20, 9:30 a.m. I Last Class: The Big Bang. I Today: The Fate of the Universe. I Quote by George Gammow: Much later, when I was discussing cosmological problems with Einstein, he remarked that the introduction of the cosmological term was the biggest blunder of his life. – George Gamow, My World Line, 1970
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The Fate of the Universe I Hubble’s law v = H 0 d Universe is expanding.
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The Fate of the Universe I Hubble’s law v = H 0 d Universe is expanding. gravity attracts so opposes expansion.
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The Fate of the Universe I Hubble’s law v = H 0 d Universe is expanding. gravity attracts so opposes expansion. ultimate fate depends on density ρ .
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The Fate of the Universe I Hubble’s law v = H 0 d Universe is expanding. gravity attracts so opposes expansion. ultimate fate depends on density ρ . critical density ρ c , expansion balanced by gravity.
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The Fate of the Universe I Possible outcomes of expansion:
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The Fate of the Universe I Possible outcomes of expansion: Unbound: expands forever — ρ < ρ c .
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I Possible outcomes of expansion: Unbound: expands forever — ρ < ρ c . Marginally bound: expansion stops at
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a1c40 - Astronomy 1 Last news report due on Dead Day, Dec....

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