A strange flash in a distant galaxy first looked like a familiar kind of stellar wreckage, the radioactive afterglow of colliding neutron stars known as a kilonova. Then it brightened again, shifted ...

Add Yahoo as a preferred source to see more of our stories on Google. Astronomers have witnessed a cosmic explosion that emitted as much energy as 400 billion suns. The event, which has been nicknamed ...

Add Yahoo as a preferred source to see more of our stories on Google. The final stage of a superkilonova. (Caltech/K. Miller and R. Hurt (IPAC)) Astronomers may have discovered a never-before-seen ...

"Our study provides a new direction to understand the whole evolutionary history of massive stars toward the formation of black hole binaries." ...

A strange cosmic blast that lit up the sky in two distinct acts is forcing astronomers to rethink how stars live and die. The event, tagged AT2025ulz, appears to be the first known case where a ...

A space explosion detected this summer burned for days on end, making it the longest and most unusual gamma-ray burst ever seen. Gamma-ray bursts are the universe’s most powerful explosions. They ...

Scientists may have to rethink their playbook for studying gamma-ray bursts, the most powerful known cosmic explosions, after a blast detected in July set a new record by firing energetic jets for ...