Ansky, a once-dormant black hole, is now emitting powerful X-ray bursts, giving scientists a rare chance to study its ...

Researchers have spent the past few years watching a black hole re-awaken roughly 300 million light-years away from Earth.

"This rare event provides an opportunity for astronomers to observe a black hole's behavior in real time," said astronomer Lorena Hernández-García.

A color image of the newly discovered black hole light echo candidate, which may be one of the biggest ever found. | Credit: Julian Shapiro, Chilescope T1 ANAHEIM, Calif. — Long after the black ...

An epic echo Shapiro currently pegs the light echo at about 150,000 to 250,000 light-years in diameter — about 1.5 to two times the width of the entire Milky Way galaxy. And if his estimates ...

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 ...