Cosmology

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Last updated 3:26 PM on 4/27/26
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16 Terms

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Scale of galaxies

kpc

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Distance between galaxies

Mpc

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Visible universe scale

Gpc

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Messier catalogue

List of nebulae, galaxies and star clusters

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The cosmological principle

The universe is homogeneous and isotropic

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Dark matter

Missing mass

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Virial theorem

2T + UG = 0

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Percentage of dark matter in universe

85%

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Percentage of dark matter + dark energy in universe

95%

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MACHOs

Massive compact halo objects

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WIMPs

Weakly interacting massive particles

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“Cold” eg. in Cold dark matter

Short mean free path in the early universe

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“Warm” eg. in Warm dark matter

Free streaming length comparable to a proto-dwarf in early universe

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“Hot” eg. in Hot dark matter

Free streaming length much larger than the size of a proto-galazy

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Dark matter rich regions

Galactic centres and halos

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