NASA’s Webb Identifies Earliest Supernova to Date, Shows Host Galaxy

December 09, 2025 11:00AM (EST)Release ID: 2025-137
Webb image shows hundreds of galaxies of all shapes and sizes against the black background of space. Toward the center-left is a large white spiral galaxy that is almost face-on. To the right of this is a large box, which zooms in on an area at top right. Within the box is a faint red dot at the center, with the label GRB 250314A.

Summary

The telescope captured near-infrared light from one of the earliest stars seen to explode in the history of the universe.

With a few near-infrared snapshots, the James Webb Space Telescope nailed down the source of a super bright flash of light known as a gamma-ray burst, generated when a massive star exploded when the universe was only 730 million years old.

And, for the first time at this point in the history of the universe, the telescope provided a detection of the resulting supernova’s host galaxy.

Webb’s quick-turn observations verified data taken by telescopes around the world that were following the gamma-ray burst that turned up in mid-March.

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Visit NASA Science to view the full news release including article text and associated Webb imagery, graphics, scientific visualizations, videos, captions, text descriptions, and other information.

News releases highlighting the discoveries of NASA’s James Webb Space Telescope are produced for NASA by the Space Telescope Science Institute (STScI) in Baltimore, Maryland, under NASA Contract NAS5-03127. News release content is developed by the News Team in STScI’s Office of Public Outreach.

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