For a long time, astronomers believed that extremely high-energy radiation was produced only in the jets of active galaxies, far from Earth. But new observations from the High-Altitude Water Cherenkov ...

Astronomers have made a shocking discovery that’s rewriting the way we think about cosmic powerhouses. While scientists ...

In a new study, scientists have found that a huge black hole - with a mass of about six Suns - is feasting upon a giant star and releasing intense radiation in deep space. The star is as big as three ...

Scientists have long thought that the highest-energy gamma rays in space are forged in the intense furnaces of very active ...