| What
Cosmologists “Do” |
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| • | Extragalactic
Astrophysicists try to explain |
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| the detailed
features and physics of galaxies, |
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| clusters of
galaxies, AGN, etc. |
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| • | Cosmologists
try to explain how large-scale |
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| structures
formed in an expanding universe |
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| from initial
density perturbations present in |
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| the early
universe. Also, what must those |
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| initial
conditions be? |
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| – | How does one
start? |
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