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  1. Physics

    The Biggest X-Ray Map of the Sky Ever Made Lists 1.9 Million Sources

    eROSITA's second data release stacks three full-sky scans from Spektr-RG's first 556 days, nearly doubling the original catalog. Paired with Sloan spectroscopy, it shows fast-growing black holes were more common in the early universe than expected.

    3 min read