Explore 25 universe mysteries scientists are still scratching their heads over, from dark matter to the Big Bang's secrets.

A decades-old cosmic mystery has finally been cracked: the strange X-rays coming from the bright star gamma-Cas are caused by ...

In a striking glimpse into extreme physics, scientists have captured the split-second chaos that unfolds when powerful laser ...

A dead star accelerates protons to extreme speeds, shedding light on the origin of the most energetic cosmic rays.

Photography student Tom Liggett sent film to 120,000 ft in a hot-air balloon, capturing images of cosmic radiation ...

A century after their discovery, cosmic rays—particles of extreme energy originating from the far reaches of the ...

Cancer researchers across the world are trying to develop treatments (ideally without side effects) for various forms of the ...

A photography student at a university has created unique works of art using cosmic rays high above the earth. Tom Liggett, ...

"First predicted by Askaryan in 1962, this radiation has its origin in the netnegative charge generated in the moving shower ...

A detector deep beneath the frozen southern continent has obtained first evidence of a rare cosmic phenomenon.