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  • BBC Sky at Night

    LORD OF THE RINGS

    Sep 16, 2021 2 minutes

    CHANDRA X-RAY OBSERVATORY/PAN-STARRS/NEIL GEHRELS SWIFT OBSERVATORY, 5 AUGUST 2021

    V404 Cygni became a short-lived celestial celebrity in 2015 when NASA’s Neil Gehrels Swift Observatory, a space observatory dedicated to scrutinising gamma-ray bursts, detected an unusual burst of X-rays coming from the constellation of Cygnus, the Swan.

    The source was a black hole 7,800 lightyears away,

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