Galaxies and Cosmology
Cosmology -- Basic Facts
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Galaxies and Cosmology
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Overview
The Local Group
Spiral Galaxies
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Cosmology -- Basic Facts
World Models
Distance Ladder and H0
Active Galactic Nuclei
Galaxy Groups and Clusters
Basic Facts
Basic Facts
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Expansion
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Homogeneity and Isotropy
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Homogeneity
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Isotropy