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Is the Universe's expansion rate 67 km/s/Mpc, 73 km/s/Mpc, or somewhere in between? The Hubble tension is real, and not so easy to resolve.

The ANITA experiment found cosmic rays shooting out of Antarctica. One interpretation claims "parallel Universes," but is that right?

Different methods of measuring the Universe's expansion rate yield high-precision, incompatible answers. But is the problem robustly real?

Launched in March, the PUNCH mission has viewed two incredible coronal mass ejections, tracking them farther from the Sun than ever before.

The tiniest galaxies of all are the most severely dominated by dark matter. Could black holes be the cause of the extra gravity instead?

A few physical quantities, in all laboratory experiments, are always conserved: including energy. But for the entire Universe? Not so much.

If you want to understand the Universe, cosmologically, you just can't do it without the Friedmann equation. With it, the cosmos is yours.

Viewing Uranus's largest moons with Hubble, astronomers hoped to find darkening on the trailing side. They found the exact opposite ...

On Earth, our particle accelerators can reach tera-electron-volt (TeV) energies. Particles from space are thousands of times as energetic.

The first galaxies were irregular blobs of gas and stars. But modern features, like spiral arms and bars, appeared earlier than expected.