Webb’s 255-hour-long observation reveals invisible dark matter in a map area containing nearly 800,000 galaxies

As part of the Cosmic Evolution Survey (COSMOS) project, Webb captured an area of the sky located in the constellation Sextans. The region measures 0.54 square degrees — that is, about two and a half times the size of a Full Moon. This expanse of sky shown in the image contains nearly 800,000 galaxies. The
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