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Some 13.8 billion years ago, the Universe became hot, dense, and filled with high-energy quanta all at once. Here’s what it was like.

Every timekeeping device works via a version of a pendulum — even the atomic clocks that are accurate to nanoseconds.

Quantum mechanics + consciousness: There is nothing better than mixing two great mysteries to produce an even bigger one.

Everything is made of matter, not antimatter, including black holes. If antimatter black holes existed, what would they do?

The DUNE project will beam tiny neutrinos across vast distances. But the first step involved moving a heavier material: 1 million tons of rock.

The anthropic principle has fascinating scientific uses, where the simple fact of our existence holds deep physical lessons. Don’t abuse it!

Singularities frustrate our understanding. But behind every singularity in physics hides a secret door to a new understanding of the world.

Many still cling to the idea that we live in a deterministic Universe, despite the nature of quantum physics. Now, the “least spooky” interpretation no longer works.

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

Quantum physics isn’t quite magic, but it requires an entirely novel set of rules to make sense of the quantum universe.

Travel half the distance to your destination, and there’s always another half to go. Despite Zeno’s Paradox, you always arrive right on time.

Does it have a deeper significance — or is it just a number?

AI was key to making Moderna’s COVID mRNA vaccine. Its role in mRNA therapeutics will rapidly grow in the coming years.

Is the multiverse real? It’s one of the hottest questions in all of theoretical physics. We invited two astrophysicists to join the debate.

From the tiniest subatomic scales to the grandest cosmic ones, solving any of these puzzles could unlock our understanding of the Universe.

From a hot, dense, uniform state in its earliest moments, our entire known Universe arose. These unavoidable steps made it all possible.

Most waves need a medium to travel through. But the way that light and gravitational waves travel shows that space can’t be a medium at all.

Scalars, vectors, and tensors come up all the time in physics. They’re more than mathematical structures. They help describe the Universe.

In our Universe, matter is made of particles, while antimatter is made of antiparticles. But sometimes, the physical lines get real blurry.

The original principle of relativity, proposed by Galileo way back in the early 1600s, remains true in its unchanged form even today.

Researchers at the Brookhaven National Laboratory recently created the heaviest exotic antimatter hypernucleus ever observed.

Magnetic monopoles began as a mere theoretical curiosity. They might hold the key to understanding so much more.

Einstein hated “spooky action at a distance,” but much to his chagrin, quantum mechanics remains as spooky as ever.

The concept of ‘relativistic mass’ has been around almost as long as relativity has. But is it a reasonable way to make sense of things?

For a substantial fraction of a second after the Big Bang, there was only a quark-gluon plasma. Here’s how protons and neutrons arose.

Is this video four minutes long? Not necessarily.

The expanding Universe, in many ways, is the ultimate out-of-equilibrium system. After enough time passes, will we eventually get there?

In Sun-like stars, hydrogen gets fused into helium. In the Big Bang, hydrogen fusion also makes helium. But they aren’t close to the same.

What do we mean by a black hole’s size? A photon sphere? The minimal stable orbit? The event horizon? The singularity? Which one is right?

For every proton, there were over a billion others that annihilated away with an antimatter counterpart. So where did all that energy go?