Orbiting Astronomical Observatory

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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Arts and letters

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What Wikipedia says

The Orbiting Astronomical Observatory (OAO) satellites were a series of four American space observatories launched by NASA between 1966 and 1972, managed by NASA Chief of Astronomy Nancy Grace Roman.

Excerpt from the Wikipedia article “Orbiting Astronomical Observatory”, under the CC BY-SA 4.0 license. Read the article on Wikipedia