Webb Telescope Confirms the Oldest Known Supernova in the Universe

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The James Webb space telescope made it possible to observe the oldest supernova ever detected, originated when the Universe was 730 million years old. The event was identified after a gamma-ray explosion (GRB) detected in March, and confirmed that the brightness came from the collapse of a massive star in a distant galaxy.The finding became a milestone for observational astronomy, as it offered an unprecedented view of the behavior of stars in t…

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An unimaginable distance: astronomers spot a supernova whose light takes more than 13 billion years to reach Earth. Thus, this star explosion is by far the earliest that has ever been discovered. A certain phenomenon gives the decisive clue.

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A fleeting light crossed the sky in March 2025 and, after months of follow-up, it has been confirmed that its origin was a supernova produced only 730 million years after the Big Bang. This observation, achieved thanks to the James Webb space telescope, sets a new record in the detection of stellar explosions that occurred in the early moments of the Universe. The event, called GRB 250314A, began with an intense emission of gamma rays, a signal …