After decades of inactivity, the black hole at the galaxy's heart burst with light. Now, the cosmic monster appears to be doing something that is forcing astronomers to re-evaluate their ...

We've all woken up in a terrible mood from time to time, but a newly observed monster black hole is really having a bad day. The previously inactive supermassive black hole at the heart of the ...

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 ...