It’s a powerful technique, but small uncertainties at each step can add up, something critics argue may be behind the Hubble ...

If not in visible stars and galaxies, the most likely hiding place for the matter is in the dark space between galaxies.

Researchers have discovered a large, orderly spiral galaxy that formed soon after the Big Bang, when space was only about 1.5 ...

The Atacama Cosmology Telescope in Chile not only confirmed one of the greatest mysteries in the universe—it also ruled out ...

New polarization maps from the Atacama Cosmology Telescope align with Planck’s results and confirm the lower early-universe ...

There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and ...

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

"It means cleaning house, narrowing the viable paths forward, and no longer spending energy on what are evidently dead ends." ...

A Nov LIGO–Virgo–KAGRA signal hints at ultra-light primordial black holes—hypothetical relics of the early universe. If ...

In the early universe, moments after the Big Bang and cosmic inflation, clusters of exotic, massive particles could have ...