Baryon acoustic oscillations

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Science and technology

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What Wikipedia says

In cosmology, baryon acoustic oscillations (BAO) are fluctuations in the density of the visible baryonic matter (normal matter) of the universe, caused by acoustic density waves in the primordial plasma of the early universe.

Excerpt from the Wikipedia article “Baryon acoustic oscillations”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: European Space Agency, CC BY-SA 3.0 igo, via Wikimedia Commons.