SMRTR Science & EngineeringDec 16, 2025Live Science

'We were amazed': Scientists using James Webb telescope may have discovered the earliest supernova in the known universe

SMRTR summary

Scientists using the James Webb Space Telescope discovered what may be the earliest supernova ever observed, occurring when the universe was only 730 million years old. The stellar explosion was linked to a gamma-ray burst detected in March, providing astronomers a rare opportunity to study how early-universe stars evolved. Researchers separated light from the supernova, its host galaxy, and the burst's afterglow to confirm their predictions. This ancient supernova closely resembles modern stellar explosions, suggesting early stars may not differ as dramatically from today's stars as previously thought.

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