Cosmic microwave background

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A topic known well beyond its field, found in many languages.

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Notion

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Science and technology

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What Wikipedia says

The cosmic microwave background (CMB, CMBR), or relic radiation, is microwave radiation that fills all space in the observable universe. With a standard optical telescope, the background space between stars and galaxies is almost completely dark.

Excerpt from the Wikipedia article “Cosmic microwave background”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA / WMAP Science Team, Public domain, via Wikimedia Commons.