When JWST looked at XLSSC 122, a galaxy cluster 10.4 billion light-years away, it caught gravity bending light from galaxies about 12 billion years in the past, and a dark matter core packed too tightly for cosmic noon - Space Daily
JWST has caught the galaxy cluster XLSSC 122 bending light from galaxies behind it into long blue-gray arcs, making a dark matter knot visible from a time when the universe was only about 3.3 billion years old. The cluster sits at redshift 1.98, with a look-b…
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