Astronomers initially thought the explosion was a Type II supernova, but some things just didn't add up.

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 ...

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 ...

Artist's rendition of GRB 250702B's ultra-relativistic jet (moving at nearly the speed of light) escaping from its dusty, massive host galaxy. Astronomers at the University of North Carolina at Chapel ...

A rare supernova appeared five times in the sky, giving scientists a new way to measure how fast the universe is expanding ...

Teams of astronomers from several institutions have discovered a strange cosmic firework in deep space that brightened the ...