It’s not only the gravity from galaxies in a cluster that reveals dark matter, but the ejected, intracluster stars actually trace it out.
Earth is actively broadcasting and actively searching for intelligent civilizations. But could our technology even detect ourselves?
Did the Milky Way form by slowly accreting matter or by devouring its neighboring galaxies? At last, we’re uncovering our own history.
Forget billions and billions. When it comes to the number of galaxies in the Universe, both theorists’ and observers’ estimates are too low.
Known as orphaned planets, rogue planets, or planets without parent stars, these “outliers” might be the most common type of planet overall.
Our galactic home in the cosmos — the Milky Way — is only one of trillions of galaxies within our Universe. Is one of them truly our “twin?”
Electromagnetism, both nuclear forces, and even the Higgs force are mediated by known bosons. What about gravity? Does it require gravitons?
When three wise men gifted baby Jesus with gold, frankincense, and myrrh, they had no idea one was made from colliding neutron stars.
There was a lot of hype and a lot of nonsense, but also some profoundly major advances. Here are the biggest ones you may have missed.
Matt Strassler’s journey into fundamental physics culminates in a brilliant explanation of the Higgs field. Enjoy this exclusive interview.
The Firefly Sparkle galaxy was only spotted because of gravitational lensing’s effects. Yet galaxies like these brought us a visible cosmos.
By improving quantum error correction, quantum computations are now faster than ever. But parallel universes? That’s utter nonsense here.
Sixty years ago, the Soviet Union was way ahead of the USA in the space race. Then one critical event changed everything.
If atoms are mostly empty space, then why can’t two objects made of atoms simply pass through each other? Quantum physics explains why.
From a hot, dense, uniform state in its earliest moments, our entire known Universe arose. These unavoidable steps made it all possible.
It was barely a century ago that we thought the Milky Way encompassed the entirety of the Universe. Now? We’re not even a special galaxy.
Even with just a momentary view of our galaxy right now, the data we collect enables us to reconstruct so much of our past history.
50 years ago, Stephen Hawking showed that black holes emit radiation and eventually decay away. That fate may now apply to everything.
The closest known star that will soon undergo a core-collapse supernova is Betelgeuse, just 640 light-years away. Here’s what we’ll observe.
We have very specific predictions for how particles ought to decay. When we look at B-mesons all together, something vital doesn’t add up.
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.
The Sombrero is the closest bright, massive, edge-on galaxy to us. JWST’s new image, taken with MIRI, finally shows what’s under its hat.
One of the fundamental constants of nature, the fine-structure constant, determines so much about our Universe. Here’s why it matters.
Gravitational waves are the last signatures that are emitted by merging black holes. What happens when these two phenomena meet in space?
For nearly 60 years, the hot Big Bang has been accepted as the best story of our cosmic origin. Could the Steady-State theory be possible?
Two parts of our Universe that seem to be unavoidable are dark matter and dark energy. Could they really be two aspects of the same thing?
Scalars, vectors, and tensors come up all the time in physics. They’re more than mathematical structures. They help describe the Universe.
Since the mid-1960s, the CMB has been identified with the Big Bang’s leftover glow. Could any alternative explanations still work?
Our classical intuition is no good in a quantum Universe. To make sense of it, we need to learn, and apply, an entirely novel set of rules.
It’s the ultimate setup for a Thanksgiving Day disaster. The physics of water and its solid, liquid, and gas phases compels us not to do it.