Using the James Webb Space Telescope, and with a little help from Einstein, astronomers have "weighed" a sleeping giant, a dormant supermassive black hole located a staggering 10 billion light-years away.
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— Source: Space.com (https://www.space.com/astronomy/james-webb-space-telescope/james-webb-space-telescope-weighs-sleeping-giant-black-hole-from-10-billion-light-years-away-and-its-6-billion-times-our-suns-mass)