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

The laws of physics obey certain symmetries and defy others. It’s theoretically tempting to add new ones, but reality doesn’t agree.

There are a wide variety of theoretical studies that call our Standard Model of cosmology into question. Here’s what they really mean.

Many contrarians dispute that cosmic inflation occurred. The evidence says otherwise.

The mismatch between theory and experiment is anything but certain. The most exciting moments in a scientist’s life occur when you get a result that defies your expectations. Whether you’re a […]

A new paper combines two concepts from the edges of astrophysics: Dyson Spheres and black holes. A Type III civilization could combine them.

When Einstein gave General Relativity to the world, he included an extraneous cosmological constant. How did his ‘biggest blunder’ occur?

Here’s what Einstein meant when he spoke of cosmic dice and the “secrets of the Ancient One”.

Although the Big Bang occurred at an instant in time long ago, we still see the light from it. Will the evidence ever disappear completely?

Everything we observe beyond our Local Group is speeding away from us, omnidirectionally. If the Universe is expanding, where is the center?

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

An innovation’s value is found between the technophile’s promises and the Luddite’s doomsday scenarios.

When you mix science with speculation, you get speculation. But the underlying science is still real. Whenever you hear the phrase, “it’s just a theory,” it should trigger alarm bells in […]

Atomic clocks keep time accurately to within 1 second every 33 billion years. Nuclear clocks could blow them all away.

The hot Big Bang was an energetic, brilliantly luminous event. Today’s Universe is alight with stars. But in between, the dark ages ruled.

Experiments cannot confirm what theory predicts about neutrinos. And particle physicists have no idea why.

You can only create or destroy matter by creating or destroying equal amounts of antimatter. So how did we become a matter-rich Universe?

It’s a wild idea, but there’s a way to test it. No matter how far we look out in the Universe, there’s always more “Universe” to see. Even at the extreme […]

Time isn’t the same for everyone, even on Earth. Flying around the world gave Einstein the ultimate test. No one is immune from relativity.

A group of prominent scientists shares how research has changed them.

The Big Bang was hot, dense, uniform, and filled with matter and energy. Before that? There was nothing. Here’s how that’s possible.

The highest-energy particles could be a sign of new, unexpected physics. But the simplest, most mundane explanation is particularly iron-ic.

It’s knowledgeable, confident, and behaves human-like in many ways. But it’s not magic that powers AI though; it’s just math and data.

How close are we to human teleportation? Successes in quantum teleportation experiments abound.

Once merely a theoretical curiosity, they might be the key to understanding so much more. Out of all of the known particles — both fundamental and composite — there are a whole slew of properties […]

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

If you want to understand the Universe, cosmologically, you just can’t do it without the Friedmann equation. With it, the cosmos is yours.

University of Tokyo scientists observe predicted quantum biochemical effects on cells.

Even without the greatest individual scientist of all, every one of his great scientific advances would still have occurred. Eventually.

Philosophers and scientists spent millennia arguing about the nature of light. It turned out to be stranger than anyone imagined.