A mysterious 10-second signal just rocked the world of astrophysics — and it came from 13 billion light-years away.
In what researchers are calling one of the most extraordinary cosmic events ever recorded, scientists using two Earth satellites detected a sudden, ultra-energetic gamma-ray burst (GRB) originating from when the universe was just 730 million years old — barely out of its cosmic cradle.
Named GRB 250314A, the explosive burst of invisible, high-energy radiation was first picked up on March 14, 2025, by the Space Variable Objects Monitor (SVOM) satellite — a joint mission between France and China. The signal lasted only 10 seconds but packed enough power to stand out across the cosmic void of 13 billion years.
Later, NASA’s James Webb Space Telescope (JWST) confirmed the explosion’s origin, capturing detailed images of its faint afterglow in the summer of 2025.
What makes this discovery a potential game-changer? This supernova looks exactly like the ones we see in today’s universe. That’s what’s rattling the experts.
The early universe was believed to be home to stars that were bigger, hotter, shorter-lived, and much more explosive. Instead, this gamma-ray burst appears eerily familiar, matching the radiation signature and brightness of modern supernovae — despite being from the first 5% of the universe’s lifetime.
“This particular event is very rare and very exciting,” said lead author Andrew Levan from Radboud University in the Netherlands. Only a handful of GRBs have ever been detected from the universe’s first billion years.
The discovery was published in Astronomy & Astrophysics in December 2025, and it could rewrite what scientists thought they knew about early stellar evolution.
The JWST’s role was pivotal. “Only Webb could directly show that this light is from a supernova — a collapsing massive star,” Levan said in a NASA statement. UK astrophysicist Nial Tanvir added, “Webb showed that this supernova looks exactly like modern supernovae.”
The implications are enormous.
If early stars behaved like today’s stars, it may mean that the universe evolved differently than theorized, or that massive star formation was more stable — or stranger — than imagined. Scientists also hinted that with JWST’s capability, they could soon detect even earlier signals — from stars that lived when the universe was just a few hundred million years old.
For now, this 10-second flash from 13 billion years ago is the oldest known supernova ever seen — a cosmic echo from the dawn of time, reminding us just how much of the universe’s earliest secrets are still hidden in the stars.
