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 ...

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 ...

Scientists have created a masterful piece of an object shooting cosmic jets in space that has long been a mystery. Despite being located billions of light-years away, this entity can be seen releasing ...