Astronomers have observed the most distant supernova ever recorded, using the James Webb Space Telescope (JWST) to peer deep into the early universe and uncover the explosive death of a massive star that occurred more than 13 billion years ago.
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According to an international research team, the stellar explosion took place when the universe was only around 730 million years old, during the so-called “era of reionization”, a formative period when the first galaxies and stars were beginning to emerge from cosmic darkness.
BREAKING 🚨: The James Webb Space Telescope spotted a chain of 20 galaxies, dubbed the Cosmic Vine.
Which stretches 13 million light-years across and dates back to just 3 billion years after the Big Bang, challenging models of early galaxy clustering. pic.twitter.com/SmlBNphFBH
— All day Astronomy (@forallcurious) December 22, 2025
The event was initially detected on March 14, 2025, through a powerful burst of gamma radiation known as a Gamma-Ray Burst (GRB). This high-energy signal was picked up by the space-based SVOM monitoring mission, alerting scientists to a potentially significant cosmic event in the distant universe.
Roughly 110 days after the initial detection, researchers directed the JWST toward the same region of space. Thanks to the telescope’s unprecedented sensitivity and resolution, scientists were able to isolate the fading light of the explosion from its extremely faint host galaxy, confirming that the GRB was linked to a supernova.
Dr Antonio Martin-Carrillo, a co-author of the study, described the discovery as a “smoking gun” linking gamma-ray bursts to the deaths of massive stars in the early universe. He noted that nearly all previously studied supernovae have been relatively close to Earth in cosmic terms.
One of the most surprising findings was that this ancient supernova closely resembles those observed in the modern universe. Scientists had expected early stars — formed in environments with far fewer heavy elements — to explode in different ways. Instead, the similarities suggest that the life cycles of massive stars have remained remarkably consistent over billions of years.
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The research team plans to revisit the site in one to two years, once the supernova’s light has fully faded. This will allow astronomers to study the host galaxy in greater detail and gain new insights into the conditions under which the earliest stars were born and died.