Sharmila Kuthunur is a Seattle-based science journalist covering astronomy, astrophysics and space exploration. Follow her on X @skuthunur.
The remarkably dense JWST-ER1 galaxy and its Einstein ring, as captured by the James Webb Space Telescope last year.A fresh analysis of a remarkably massive yet compact galaxy from the early universe suggests that dark matter interacts with itself." — an unbroken circle of light around the galaxy, a result of light rays from a distant, unseen galaxy being bent due to the space-warping mass of JWST-ER1.
The halo of dark matter, densest at the galaxy's center, is the gravitational glue that prevents spinning galaxies from flying apart. Furthermore, models incorporating a certain type of dark matter, in which its particles interact with themselves, provide"an excellent fit to the measurement of JWST-ER1," according to the
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