Most space missions rely on chemical rockets for propulsion. Rockets must carry fuel, which increases spacecraft mass and limits their speed and travel distance. For decades, researchers have explored ...

Physicists have directly tracked tiny points of darkness in laser light racing faster than light itself, without breaking Einstein’s rules. The new measurements show that these “dark points” in a ...

From repairing damaged retinas in the human eye to burning precision holes in industrial diamonds, the list of uses for laser light has grown steadily since the fierce, pure beams were first projected ...