Explorer 49

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What Wikipedia says

Explorer 49 (also called Radio Astronomy Explorer-2, RAE-B) was a NASA 328 kg (723 lb) satellite launched on 10 June 1973, for long wave radio astronomy research. It had four 230 m (750 ft) X-shaped antenna elements, which made it one of the largest spacecraft ever built.

Excerpt from the Wikipedia article “Explorer 49”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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