The James Webb Space Telescope has taken a stunning image of a perfectly formed Einstein ring, which is also the most distant gravitationally lensed object ever detected.
itself is estimated to be about 13.7 billion years, the universe's constant expansion means that light from the oldest objects must travel much farther than this to reach our telescopes).Thanks to the complete ring of JWST-ER1, researchers calculated the mass of the lensing galaxy by seeing how much it had warped space-time around itself. This revealed that the galaxy has a mass equivalent to around 650 billion suns, which makes it unusually dense for its size.
"Additional mass is needed to explain the lensing results," but it is not exactly clear what this mass is, the researchers wrote in the paper. The complete Einstein ring, JWST-ER1, is the most distant gravitationally-lensed object ever discovered.
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