JWST spots smallest galaxy outside our local universe
The James Webb Space Telescope has glimpsed the smallest galaxy outside our local universe – and it is a thousand times less massive than the Milky Way
21 October 2022
The James Webb Space Telescope (JWST) has spotted the smallest galaxy outside our local universe using the universe’s heaviest known cluster of galaxies, called El Gordo, as a giant lens.
El Gordo was first discovered in 2011. Follow-up measurements found it contained so much mass – the equivalent of 3 million billion suns – that it was at the very limit of what standard cosmological theory predicts. This huge mass makes it useful as …