Dark flow

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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Science and technology

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What Wikipedia says

In astrophysics, dark flow is a controversial hypothesis to explain certain non-random measurements of peculiar velocity of galaxy clusters. The actual measured velocity is the sum of the velocity predicted by Hubble's law plus a possible small velocity flowing in a common direction.

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

Image: NASA/Goddard/A. Kashlinsky, et al., Public domain, via Wikimedia Commons.