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For generations, physicists have been searching for a quantum theory of gravity. But what if gravity isn't actually quantum at all?

How are we to deal with the quantization of spacetime and gravity?

Isaac Newton and Albert Einstein are locked in an eternal battle over the nature of gravity. Whose side are you on?

Gravity defies quantum mechanics. What does that mean for a theory of everything?

This measurement is crucial to confirm that one of the assumptions of Einstein’s theory of gravity is valid.

Newton thought that gravitation would happen instantly, propagating at infinite speeds. Einstein showed otherwise; gravity isn't instant.

Roger Babson wanted a “partial insulator, reflector, or absorber of gravity” — something, anything, that would stop or dampen it.

Thanks to observations of gravitational waves, scientists were able to settle a longstanding debate over the speed of gravity.

19 years ago, the Bullet Cluster provided an empirical proof for dark matter. Even today, modified gravity still can't explain it.

Seventy-five years after the anomaly's discovery, scientists have finally figured out why sea levels are so much lower here.

Sci-fi enthusiasts have long hoped that a substance called antimatter might experience gravity opposite that of ordinary matter. It doesn't.

In general relativity, matter and energy curve spacetime, which we experience as gravity. Why can't there be an "antigravity" force?

Three fundamental forces matter inside an atom, but gravity is mind-bogglingly weak on those scales. Could extra dimensions explain why?

A clock, designed and built in Europe, ran hopelessly at the wrong rate when brought to America. The physics of gravity explains why.

We have two descriptions of the Universe that work perfectly well: General Relativity and quantum physics. Too bad they don't work together.

Particles behave differently when freed from the force of gravity. A new space factory aims to use this to synthesize pharmaceuticals.

Old coal mines can be converted into "gravity batteries" by retrofitting them with equipment that raises and lowers giant piles of sand.

Quantum wormholes are mathematically possible — but might also be physically impossible. Physicist Janna Levin explains Hawking’s famous information paradox.

Our intuitive understanding of time is very different from a physicist's understanding of time. How do we reconcile these views?

Einstein's laws of gravity have been challenged many times, but have always emerged victorious. Could wide binary stars change all that?

Its apples taste bad, but institutions all over the world want a descendant or clone of the tree, anyway.

In the quest to measure how antimatter falls, the possibility that it fell "up" provided hope for warp drive. Here's how it all fell apart.

Though he renounced philosophy, Stephen Hawking's final theory of the universe redraws the basic foundations of cosmology.

The theory is accurate within at least one part in a quadrillion.

The Universe gravitates so that normal matter and General Relativity alone can't explain it. Here's why dark matter beats modified gravity.

It's not only the gravity from galaxies in a cluster that reveal dark matter, but the ejected, intracluster stars actually trace it out.

Maybe the brain isn't "classical" after all.

When it comes to predicting the energy of empty space, the two leading theories disagree by a factor of 100 googol quintillion.

Bang bang all over the Universe.

Capacitors, acid batteries, and other methods of storing electric charges all lose energy over time. These gravity-fed batteries won't.