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Physics
The combination of charge conjugation, parity, and time-reversal symmetry is known as CPT. And it must never be broken. Ever.
In traveling through the expanding Universe, particles slow down while light and gravitational waves redshift. What degrades and what won't?
Even space and time are relative in Einstein's universe. That means our old notions of "where" and "when" no longer apply on cosmic scales.
The fundamental building blocks of reality are indivisible: quanta that cannot be split or divided. Our understanding remains incomplete.
Many reactions emit energy, often in large amounts, but cosmic efficiency is another metric altogether. Here's how to maximize your output.
Even the most brilliant mind in history couldn't have achieved all he did without significant help from the minds of others.
Two main contributors enabled our modern global positioning system (GPS): Albert Einstein and Gladys West. Here's how she made it happen.
Travel half the distance to your destination, and there's always another half to go. So how do you eventually arrive? That's Zeno's Paradox.
While ice itself is slick, slippery, and difficult to navigate across under most circumstances, skaters easily glide across the ice.
Some vital, key ingredients must be in place for the Universe to make more matter than antimatter. The LHC took us one step closer in 2025.
We first measured G, the gravitational constant, back in the 18th century. As the least well-known fundamental constant, can it be improved?
Until the late 20th century, there wasn't a truly universal standard. Under our current definition, everyone agrees on what "one meter" is.
We've now detected hundreds of gravitational waves with LIGO, Virgo, and KAGRA. What if we tried Weber's original method in the modern day?
Times dilate and lengths contract near the speed of light. Bizarre and confusing? Sure. But under relativity, it can't be any other way.
Nearly 100 years after being theorized, the strange behavior of the neutrino still mystifies us. They could be even stranger than we know.
Investment in quantum is growing. Anastasia Marchenkova wants to make sure funders still ask the tough questions.
The whole isn't greater than the sum of its parts; that's a flaw in our thinking. Non-reductionism requires magic, not merely science.
Quantum mechanics was first discovered on small, microscopic scales. 2025's Nobel Prize brings the quantum and large-scale worlds together.
If you think of the Big Bang as an explosion, we can trace it back to a single point-of-origin. But what if it happened everywhere at once?
10 years ago, LIGO first began directly detecting gravitational waves. Now better than ever, it's revealing previously unreachable features.
In this excerpt from "Facing Infinity," Jonas Enander examines how John Michell conceived of "dark stars," or massive bodies with enough gravity to trap light, all the way back in 1783.
Since even before Einstein, physicists have sought a theory of everything to explain the Universe. Can positive geometry lead us there?
Explanations for the cosmic speed limit often conflate mass with inertia.
A next-generation collider is required for studying particle physics at the frontiers. Here's the fastest, cheapest way to get it done.
Amplifying the energy within a laser, over and over, won't get you an infinite amount of energy. There's a fundamental limit due to physics.
From high school through the professional ranks, physicists still take incredible lessons away from Newton's second law.
The measured value of the cosmological constant is 120 orders of magnitude smaller than what's predicted. How can this paradox be resolved?
If the Universe is 13.8 billion years old today, but different ages the farther we look back, what does it mean for a star to be the first?
When theory and experiment disagree, it could mean new physics. This time, they solved the muon g-2 puzzle, and saved the Standard Model.
For decades, astronomers have claimed the Milky Way will merge with Andromeda in ~4 billion years. Here's why, in 2025, that seems unlikely.