While sifting out signatures of supernova remnants, a high-schooler stumbled upon the afterglow of a dormant black hole. It ...

A high school student in New York has stumbled onto a massive discovery — a cosmic light echo possibly spanning twice the width of the Milky Way. While scanning space for signs of dying stars, 17-year ...

ANAHEIM, Calif. — Long after the black hole in the center of a galaxy sputters out, you can still see its ghost lingering in surrounding gas clouds aglow with leftover radiation, like wisps of ...