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Is gravity weaker over distances of billions of light-years?

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

Despite no experimental evidence showing that gravitons exist, they remain a respectable concept in the world of professional physicists.

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

Beyond stars, galaxies, and gravity, studying the fundamental workings of nature reveals widely applicable lessons for learners everywhere.

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

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

Electromagnetism, both nuclear forces, and even the Higgs force are mediated by known bosons. What about gravity? Does it require gravitons?

For centuries, Newton’s inverse square law of gravity worked beautifully, but no one knew why. Here’s how Einstein finally explained it.

Humans, when we consider space travel, recognize the need for gravity. Without our planet, is artificial or antigravity even possible?

There are many theories of gravity out there, and many interpretations of wide binary star data. What have we really learned from it all?

Einstein’s general relativity has reigned supreme as our theory of gravity for over a century. Could we reduce it back down to Newton’s law?

In theory, dark matter is cold, collisionless, and only interacts via gravity. What we see in ultra-diffuse galaxies indicates otherwise.

All the stars, stellar corpses, planets, and other large, massive objects take on spherical or spheroidal shapes. Why is that universal?

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

Forensics has reached the final frontier, and could be used to solve future space accidents—or crimes.

Physicists recently created Coordinated Lunar Time, a time zone for our Moon.

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

DESI has allowed astronomers to create an unprecedented 3D map of the Universe representing 20% of the entire sky.

Here on Earth, we commonly use terms like weight (in pounds) and mass (in kilograms) as though they’re interchangeable. They’re not.

Time is relative, not absolute, as gravity and motion both cause time to dilate. Your head and feet, therefore, don’t age at the same rate.

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

The standard picture of our Universe is that it’s dominated by dark matter and dark energy. But this alternative is also worth considering.

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.

Matt Strassler’s journey into fundamental physics culminates in a brilliant explanation of the Higgs field. Enjoy this exclusive interview.

Here in our Universe, both normal and dark matter can be measured astrophysically. But only normal matter can collapse. Why is that?

Want to avoid getting “spaghettified” by a black hole? Steer clear of the smaller ones.

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

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