Dark matter halo

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In modern models of physical cosmology, a dark matter halo is a basic unit of cosmological structure. It is a hypothetical region that has decoupled from cosmic expansion and contains gravitationally bound matter.

Excerpt from the Wikipedia article “Dark matter halo”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: http://en.wikipedia.org/wiki/User:Cosmo0, Public domain, via Wikimedia Commons.