The newly discovered "blazar," which has a mass equal to 700 million suns, is the oldest of its kind ever seen and changes what we know about the early universe.

To work out how old the grains were, the researchers measured how long they had been exposed to cosmic rays in space. These rays are high-energy particles that travel through our galaxy and ...

"Cosmic rays are a century-old mystery," Mathieu de Naurois ... Hess unveiled a natural source of high-energy particles from space. Today, we call those particles cosmic rays.

When the high-energy particle pancake (the one ... into new physics and possibly even put the hundred-year-old mystery of cosmic rays to rest. "We've been looking at the sky for a long time ...