Scientists use Einstein’s equations to reveal what came before the Big Bang
Some of the hardest questions in cosmology begin where the usual math gives up. Push Einstein’s theory far…
Scientists Say a New Universe Could Form Inside a Dying Star
An expanding mini-universe could counterbalance the collapsing matter of a star, thereby creating a stable gravastar. Credit: Daniel…
A prototype differential atom interferometer for fundamental physics
Cooling sequence The cold-atom apparatus used in this experiment has previously been described in refs. 42,56. To prepare…
Astronomers Confirm Dark Energy After Shock Challenge Rocked Cosmology
Astronomers have reaffirmed one of modern science’s most important discoveries: the universe is still expanding at an accelerating…
How Serious Is the Universe’s Expansion Problem?
With consistent, impressive leaps in observational technology, cosmology keeps running into all kinds of issues. One infamous problem…
AI Learned the Rules of the Universe and That Became a Problem
Two images from the Quijote simulations used in this study. The panels show the same region of the…
Scientists Develop a New Way To Measure Gravitational Waves in the Expanding Universe
Gravitational waves are typically studied as faint disturbances moving through otherwise quiet spacetime, but the situation becomes far…
Collapsing stars could form gravastars instead of black holes
A black hole is supposed to be the last word in stellar collapse: matter falls inward, spacetime caves…
The Strange “Spacetime Crystal” That Can Suddenly Turn Into a Black Hole
Physicists have long known that black holes do not necessarily have to form from collapsing stars. Under the…
AI Learned How the Universe Works—and That Created an Unexpected Problem for Physicists
When cosmology makes headlines, we often see fancy images of cosmic maps and supernovas. But in reality, scientists…
Precise measurement of the absolute sky brightness at 60–350 MHz
GINAN receiver with advanced architecture The GINAN receiver implements a new architecture that dynamically self-calibrates for receiver noise…
A Universe Without Dark Energy? Mathematicians Challenge Standard Cosmology
A new analysis argues that the standard cosmological model may be fundamentally unstable, raising questions about whether dark…