What set this blast apart was how quickly that first impression began to unravel. As astronomers continued to monitor AT2025ulz, they saw its light curve and color evolution diverge from the standard ...

Caltech astronomer Mansi Kasliwal and her colleagues were not expecting to chase a mystery that blurred the line between a supernova and a kilonova. Yet that is where the evidence has led after an ...

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 ...