Three thought experiments involving “demons” have haunted physics for centuries. What should we make of them today?

If you're going to Mars you'd best take along a jar of anti-aging cream because while you're there you're going to age faster ...

Warp drives have long lived in the realm of science fiction, but the underlying physics that inspired them is very real and ...

Time on Mars does not match time on Earth, and the difference is no longer a thought experiment. Precision calculations now show that clocks on the red planet tick measurably faster, confirming a ...

Summary: Time doesn’t flow uniformly across the solar system, and new research reveals just how differently it unfolds on Mars compared with Earth. By tracing subtle gravitational and orbital ...

On Earth, knowing the time feels simple. Your phone pings the same second as a GPS satellite and an atomic clock in a lab.