Proton

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Notion

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Science and technology

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What Wikipedia says

Proton (Russian: протон) ('proton') was a Soviet series of four cosmic ray and elementary particle detecting satellites. Orbited 1965–68, three on test flights of the UR-500 ICBM and one on a Proton-K rocket, all four satellites completed their missions successfully, the last reentering the Earth's atmosphere in 1969.

Excerpt from the Wikipedia article “Proton (satellite program)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA HEASARC, Public domain, via Wikimedia Commons.