Einstein Observatory

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What Wikipedia says

Einstein Observatory (HEAO-2) was the first fully imaging X-ray telescope put into space and the second of NASA's three High Energy Astrophysical Observatories. Named HEAO B before launch, the observatory's name was changed to honor Albert Einstein upon successfully attaining orbit.

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

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