In the first millionths of a second after the Big Bang, the universe was a roiling, trillion-degree plasma of quarks and gluons — elementary particles that briefly glommed together in countless ...

Can one particle explain both dark matter and the mysterious origins of matter and antimatter? Some physicists think so. They're calling the as-yet-only-theoretical object the "X particle." Physicists ...

Physicists at the world's largest atom smasher have detected a mysterious, primordial particle from the dawn of time. About 100 of the short-lived "X" particles — so named because of their unknown ...

The Large Hadron Collider (LHC), which is the world's largest atom smasher, may have just made one of the greatest scientific discoveries in recent memory. If matter and antimatter existed in equal ...