Warm–hot intergalactic medium

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

The warm–hot intergalactic medium (WHIM) is the sparse, warm-to-hot (105 to 107 K) plasma that cosmologists believe to exist in the spaces between galaxies and to contain 40–50% of the baryonic 'normal matter' in the universe at the current epoch.

Excerpt from the Wikipedia article “Warm–hot intergalactic medium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: I am not sure, CC BY-SA 4.0, via Wikimedia Commons.