Explorer 4

Rarity: Common

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At a glance

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Science and technology

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What Wikipedia says

Explorer 4 was an American satellite launched on 26 July 1958. It was instrumented by Dr. James van Allen's group.

Excerpt from the Wikipedia article “Explorer 4”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Auteur inconnu, Public domain, via Wikimedia Commons.