SIA Acc. 20-111, Smithsonian Astrophysical Observatory, Website Records, 2019

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This accession consists of web-based content related to the first image ever taken of a black hole. The image was captured in April 2017 during observations made by the Chandra X-ray Observatory in coordination with the Event Horizon Telescope and was publicly announced in April 2019. The Chandra X-ray Observatory is operated by the Smithsonian Astrophysical Observatory for the United States National Aeronautics and Space Administration. A press release, issued on April 10, 2019, by the Harvard-Smithsonian Center for Astrophysics (CfA), was crawled on April 11, 2019. The CfA is a joint venture between the Smithsonian Astrophysical Observatory and the Harvard College Observatory. A blog post, issued on April 8, 2019, by the Chandra X-ray Observatory, was also crawled on April 11, 2019. In addition, the search results of Twitter posts containing the hashtag "#EHTBlackHoleQ" were captured on July 1, 2019. Twitter is a microblogging platform and the hashtag was used for posts related to a question and answer session on April 10, 2019. Materials are in electronic format.


  • Twitter (Firm)
  • Chandra X-ray Observatory (U.S.)
  • United States National Aeronautics and Space Administration
  • Harvard-Smithsonian Center for Astrophysics
  • Harvard College Observatory
  • Event Horizon Telescope


  • Electronic List in accession file.
  • Folder List in accession file.
  • For a description of the record series of which these materials form a part, refer to the "Forms part of" above.



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  • Public relations
  • Astronomical observatories
  • Astrophysics
  • Blogs
  • Black holes (Astronomy)
  • Museums
  • Web sites
  • Museums--Public relations
  • Research


  • Web sites
  • Collection descriptions
  • Electronic records

Local number

SIA Acc. 20-111

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