Hills cloud

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 astronomy, the Hills cloud (also called the inner Oort cloud and inner cloud) is a theoretical vast circumstellar disc, interior to the Oort cloud and roughly aligned with the solar ecliptic plane, whose outer border would be located at around 20,000 to 30,000 astronomical units (AU) from the Sun, and whose inner border, less well defined, is hypothetically located at 250–1500 AU, well beyond planetary and Kuiper Belt object orbits—but distances might be much greater.

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

Image: cmglee, ESA, NASA, CC BY-SA 4.0, via Wikimedia Commons.