The data was collected by the eROSITA X-ray telescope on board the Spektrum-RG satellite. The map, known as the eRASS1, contains over 900,000 sources, including more than 700,000 supermassive black holes.

 This is the largest collection of X-ray sources ever published and has already surpassed the number of known X-ray sources in the history of X-ray astronomy. 

The eRASS1 observations were conducted between December 2019 and June 2020.

 This groundbreaking achievement in X-ray astronomy has discovered more sources than the well-known missions XMM-Newton and Chandra have found in their combined 25 years of operation.

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