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Cosmology
At all distances, the Universe expands along our line-of-sight. But we can't measure side-to-side motions; could it be rotating as well?
Modern cosmology conjectures different possible fates for the Universe and thus for the end of time. Details depend on which model is right.
Since at least 600 BC, people have been mesmerized by the concept of the infinite.
No matter how beautiful, elegant, or compelling your idea is, if it disagrees with observation and experiment, it's wrong.
Experiments cannot confirm what theory predicts about neutrinos. And particle physicists have no idea why.
The Universe is expanding, and the Hubble constant tells us how fast. But how can it be a constant if the expansion is accelerating?
Quite a lot, actually, even though it has no identifiable value as a scientific concept.
With two different black hole event horizons now directly imaged, we can see that they are, in fact, rings, not disks. But why?
The James Webb Space Telescope is about to begin science operations. Here's what astronomers are excited about.
Where did the “seed” magnetic field come from in the first place?
Giant particle accelerators aren't a waste of money. They are essential for understanding the Universe.
In all of science, no figures have changed the world more than Einstein and Newton. Will anyone ever be as revolutionary again?
The Standard Model of elementary particles has three nearly identical copies of particles: generations. And nobody knows why.
There is nothing more important to science than its ability to prove ideas wrong.
According to renowned physicist Christophe Galfard, physics can’t explain our universe - yet.
John Templeton Foundation
The observable Universe is 92 billion light-years in diameter. These pictures put just how large that is in perspective.
Over time, the Universe becomes less dominated by dark matter and more dominated by dark energy. Is one transforming into the other?
"The pulsar sort of consumes the thing that recycled it, just as the spider eats its mate.”
13.8 billion years ago, the hot Big Bang gave rise to the Universe we know. Here's why the reverse, a Big Crunch, isn't how it will end.
In all of human history, only 5 spacecraft have had the right trajectory to exit the Solar System. Will they ever catch Voyager 1?
Everything is made of matter, not antimatter, including black holes. If antimatter black holes existed, what would they do?
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.
The Standard Model may or may not be in trouble, but particle physics definitely needs saving. Here's what the new LHC can do.
For a thousand light-years in all directions, there's a "bubble" that the Sun sits at the center of. Here's the story behind it.
Look out at a distant object, and you're not seeing it as it is today. It's size, brightness, and actual distance are all different.
Singularities frustrate our understanding. But behind every singularity in physics hides a secret door to a new understanding of the world.
We take for granted that time is real. But what if it's only an illusion, and a relative illusion at that? Does time even exist?
Ancient helium-3 from the dawn of time leaks from the Earth, offering clues to our planet’s formation. A key question is where it leaks from.