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 ...

Albert Einstein had described the special theory of relativity in 1905. The result of Einstein's thinking about light, this theory introduced brand-new ideas to science. It opened up an entire field ...

Since 1915 when Albert Einstein published his theory of general relativity, scientists have worked on testing its limits, and with the results of this 16-year test, it still holds up. Professor ...

The MICROSCOPE mission tested the weak equivalence principle with free-falling objects in a satellite. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

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

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

The universe’s accelerating expansion has long puzzled physicists. For decades, dark energy, an unseen force thought to make ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. General relativity has withstood perhaps its toughest challenge to date. The theory, which Albert ...

Do you know what connects Edwin Hubble’s theory for an expanding universe and Albert Einstein’s cosmological constant? The ...