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

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

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

Using the MUSE instrument on ESO’s VLT , a team led by Thomas Collett from the University of Portsmouth in the UK first calculated the mass of ESO 325-G004 by measuring the movement of stars within ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

Research teams on both sides of the Atlantic have shown that precise modeling of the universe and its contents will change the detailed understanding of the evolution of the universe and the growth of ...

Quantum theory and Einstein's theory of general relativity are two of the greatest successes in modern physics. Each works ...

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

New impressions A visualization of a curved space–time “sea” from the general-relativity simulations carried out by the authors.(Courtesy: James Mertens) From the Genesis story in the Old Testament to ...