Universe

We can and should look harder for evidence of alien visitors to our solar system

The cosmos is dark. The Lilly-Madau diagram reveals that it will become much darker still

The James Webb Space Telescope’s search for the earliest stars and black holes has yielded a very weird, very red, puzzle

Analyzing 1,504 supernovae into the distant universe, astronomers have shown the clearest evidence yet for cosmological time dilation as predicted by Einstein

NASA’s James Webb Space Telescope observed an unusually large and highly luminous galaxy at a record-breaking 290 million years after the big bang

The shape of the cosmos could be much more complex than anyone had ever imagined

Cosmic Microwave Background Stage 4, a top-priority project for U.S. astrophysics, was designed to make breakthrough observations of the universe’s very earliest moments. Now the U.S. government says it can’t currently support the project’s construction at the South Pole

For the first time, scientists observed matter’s free fall into a black hole’s “plunging region”

How do astronomers find the darkest objects in the universe?

Every now and then, tiny particles of antimatter strike Earth from cosmic parts unknown. A new balloon-borne experiment launching this spring may at last find their source

String theory could provide a theory of everything for our universe—but it entails 10⁵⁰⁰ (more than a centillion) possible solutions. AI models could help to find the right one

Domain walls, long a divisive topic in physics, may be ideal explanations for some bizarre cosmic quirks