Because the moon has less gravity than Earth does, time passes slightly differently there. This effect was first predicted by ...

Einstein’s Theory of General Relativity is currently our best approximation of how the universe ticks. But there are holes.

China has quietly solved a problem that only becomes obvious once you try to live and work off-world: clocks on the moon do ...

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Wormholes are often imagined as tunnels through space or time—shortcuts across the universe. But this image rests on a ...

Every time a coffee mug drops, a satellite orbits or an astronaut floats, we are watching the same phenomenon play out under ...