The highest-energy photon ever seen from a cosmic blast should have been absorbed en route, and quantum gravity may explain why it wasn't.

E = mc 2 may be the most quotidian equation in physics. Everyone’s heard of it and it’s been proven time and again. Did you convert mass into energy? Go tell it to the stars, whose light is generated ...

Physicists from Trinity College Dublin believe new insights into the behavior of light may offer a new means of solving one of science's oldest challenges—how to turn heat into useful energy. Their ...