A vast, flat sheet of dark matter may solve the long-standing mystery of why our neighboring galaxy Andromeda is speeding toward us while our other neighbors are moving away from us.

Will two rare supernovas finally tell us how fast the universe is expanding? Perhaps, but we'll have to wait for it for them to 'reappear'.

The gaseous cocoons surrounding "little red dots" hint at their true nature, a new James Webb telescope study hints.

An inexplicably hot, fast-growing cluster of galaxies in the early universe has scientists questioning theories of galactic evolution.

The Atacama Cosmology Telescope (ACT) in Chile has released its final batch of data after 15 years — and it proves that the Hubble tension, a rift in our understanding of the universe, is very real.

The James Webb Space Telescope may have discovered Population III stars, the universe's first generation of stars. They may tell us more about how galaxies form.

While scouring images from the James Webb Space Telescope, astronomers spotted Capotauro, "one of the most puzzling discoveries" to date.

Researchers have found a suspected clump of dark matter lurking within the luminous halo of a well-known "Einstein ring." The mysterious object, the smallest of its kind ever seen, could help shed light on the universe's missing matter.

Using observations from the James Webb Space Telescope, astrophysicists have spotted what they say is compelling evidence of a new type of cosmic object called a 'dark star.'

New computer simulations suggest the first magnetic fields that emerged after the Big Bang were much weaker than expected — containing the equivalent magnetic energy of a human brain.