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Cosmology
Despite many ultra-distant galaxy candidates found with JWST, we still haven't seen anything from the Universe's first 250 million years.
It's possible to remove all forms of matter, radiation, and curvature from space. When you do, dark energy still remains. Is this mandatory?
With the discovery of Porphyrion, we've now seen black hole jets spanning 24 million light-years: the scale of the cosmic web.
Within our observable Universe, there's only one Earth and one "you." But in a vast multiverse, so much more becomes possible.
A recent experiment challenges the leading dark matter theory and hints at new directions for uncovering one of the Universe's biggest mysteries.
Most fundamental constants could be a little larger or smaller, and our Universe would still be similar. But not the mass of the electron.
In the expanding Universe, different ways of measuring its rate give incompatible answers. Nobel Laureate Adam Riess explains what it means.
3mins
From nothing to everything: How zero changed our understanding of the universe, forever.
The Lyman-α emission line has never been seen earlier than 550 million years after the Big Bang. So why does JADES-GS-z13-1-LA have one?
Although a great many unidentified sights have been seen in the skies, none have conclusively demonstrated the presence of aliens. So far.
Taught in every introductory physics class for centuries, the parabola is only an imperfect approximation for the true path of a projectile.
Inflation, dark matter, and string theory are all proposed extensions to the prior consensus picture. But what does the evidence say?
The observation that everything we know is made out of matter and not antimatter is one of nature's greatest puzzles. Will we ever solve it?
The mass that gravitates and the mass that resists motion are, somehow, the same mass. But even Einstein didn't know why this is so.
Scientific surprises, driven by experiment, are often how science advances. But more often than not, they’re just bad science.
The "little red dots" were touted as being too massive, too early, for cosmology to explain. With new knowledge, everything adds up.
The Universe isn't just expansion, but the expansion itself is accelerating. So why can't we feel it in any measurable way?
No matter how good our measurement devices get, certain quantum properties always possess an inherent uncertainty. Can we figure out why?
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?
DUNE is designed to detect the Universe's most antisocial particle: the neutrino.
3mins
What drives the universe's expansion? Chemist Lee Cronin explains the theories linking time, space, and selection, providing a fresh perspective on this cosmic mystery.
The Universe is 13.8 billion years old, going back to the hot Big Bang. But was that truly the beginning, and is that truly its age?
Many contrarians dispute that cosmic inflation occurred. The evidence says otherwise.
In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?
The big question isn't whether the Universe is expanding at 67 or 73 km/s/Mpc. It's why different methods yield such different answers.
Most stars in the Universe are located in big, massive, Milky Way-like galaxies. But most galaxies aren't like ours at all.
More than any other equation in physics, E = mc² is recognizable and profound. But what do we actually learn about reality from it?
For centuries, Newton's inverse square law of gravity worked beautifully, but no one knew why. Here's how Einstein finally explained it.
From size to mass to density and more, each world in our Solar System is unique. When we compare them, the results are truly shocking.
Dark matter's hallmark is that it gravitates, but shows no sign of interacting under any other force. Does that mean we'll never detect it?