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

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.

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.

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

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

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

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

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.

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

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

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

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

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

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

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

Perhaps wormholes will no longer be relegated to the realm of science fiction.

The big-picture physics is simple – let gravity do its job.

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

Leading a scientific revolution is easy: you just have to succeed where the current theory fails while equaling its successes. Good luck!

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

Einstein's "happiest thought" led to General Relativity's formulation. Would a different profound insight have led us forever astray?

The key problem with the dark matter hypothesis is that nobody knows what form dark matter might take.

Stars orbiting black holes were observed to move significantly slower than expected. One explanation centers on dark matter.

With a telescope at just the right distance from the Sun, we could use its gravity to enhance and magnify a potentially inhabited planet.