Time is not absolute, with gravity and velocity affecting how fast it passes, making clocks at different heights or near ...

The original version of this story appeared in Quanta Magazine. Two blind spots torture physicists: the birth of the universe and the center of a black hole. The former may feel like a moment in time ...

“You can’t beat the view,” astronaut George Clooney says to NASA scientist Sandra Bullock as they gaze from their space station at the Earth, 372 miles below. Gravity enjoyed a similarly lofty view ...

Researchers are 3D printing human muscle in zero gravity to create better disease models and improve astronaut health during space missions.