The most energetic particles ever made on Earth, which are protons at the Large Hadron Collider, can travel incredibly close to the speed of light in a vacuum: 299,792,455 meters-per-second, or 99 ...

So as far as we know, only small particles can get anywhere near the speed of light. One hundred years ago, on May 29, 1919, scientists performed measurements of a solar eclipse that confirmed ...

Mysterious ribbons of grayish white have been spotted woven through the northern lights. New images reveal that these ghostly glows can appear tucked within or curled up beside red and green auroras.

On its surface, entanglement allows particles to communicate over vast distances instantly, apparently violating the speed of light. But while entangled particles are connected, they don't ...