WASHINGTON: NASA's James Webb Space Telescope has spotted the earliest-known galaxy, one that is surprisingly bright and big considering it formed during the universe's infancy - at only 2 per cent its current age.
An infrared image from NASA's James Webb Space Telescope, taken by the NIRCam for the JWST Advanced Deep Extragalactic Survey, or JADES, program. One such galaxy, JADES-GS-z14-0 , was determined to have formed about 290 million years after the Big Bang, making it the earliest-known galaxy.
This galaxy, called JADES-GS-z14-0, measures about 1,700-light years across. A light year is the distance light travels in a year, 9.5 trillion km. It has a mass equivalent to 500 million stars the size of our sun and is rapidly forming new stars, about 20 every year. "I think everyone's jaws dropped," added astrophysicist and study co-author Francesco D'Eugenio of the Kavli Institute for Cosmology at the University of Cambridge."Webb is showing that galaxies in the early universe were much more luminous than we had anticipated."
"The fact that it's so bright is also fascinating, given that galaxies tend to grow larger as the universe evolves, implying that it would potentially get significantly brighter in the next many hundred million years," Hainline said. "These galaxies formed in an environment that was much more dense and gas-rich than today. In addition, the chemical composition of the gas was very different, much closer to the pristine composition inherited from the Big Bang - hydrogen, helium and traces of lithium," D'Eugenio said.
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