The James Webb Space Telescope has spotted a galaxy cluster 30 billion light years away. It's the most distant cluster found yet and may be colossal – it's likely it has roped in thousands of additional galaxies with its gravity
. Redshift is a phenomenon caused by the expansion of the universe, which means that the further away an object is, the faster it is moving away from us. This changes the wavelength of its light, similar to how the pitch of an ambulance’s siren changes as it drives by.
“We knew for a while from the Hubble data that there was an interesting over-density of galaxies,” said Morishita in a . “It came as a surprise when we first saw the spectra from JWST – all seven galaxies were aligned at the exact same redshift.”Because light takes time to travel from distant objects to JWST’s position orbiting the sun, the telescope sees these galaxies as they were about 650 million years after the big bang. As we currently see the proto-cluster, it appears small.
“We can see these distant galaxies like small drops of water in different rivers, and we can see that eventually they will all become part of one big, mighty river,” said
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