page_title: Einstein Observatory
hierarchical_section_title: Einstein Observatory
context_page_description: Einstein Observatory 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 its successfully attaining orbit.
context_section_description: 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 its successfully attaining orbit.
caption: Einstein Observatory
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