universe

Astronomers are snooping on the Milky Way's galactic neighbors to gain insights about the ancient galaxies being viewed by the James Webb Space Telescope.

A warp in the fabric of space and time that acted like a giant magnifying glass may help solve a celestial mystery about the rate of the universe's expansion.

Dark energy, the mysterious force apparently driving the accelerating expansion of the universe, is spread uniformly across space and time, new observations of massive galaxy clusters suggest.

A faraway proto-galaxy has been observed feeding on recycled material, shedding more light on how galaxies sustain star birth across eons.

Astronomers have found the fingerprints of material dispersed by the supernova deaths of the universe's first stars in distant gas clouds.

The James Webb Space Telescope has spotted galaxies further away in the universe than any other instrument before. How can we be sure these early galaxies aren't closer and more recent?

NASA's James Webb Space Telescope looked at the same distant patch of sky that Hubble did, revealing yet more detail in the famous Ultra Deep Field.

Cosmologists have a problem: Their measurements of the rate of expansion of the universe don't agree. And a new, highly accurate measurement of variable stars could deepen this 'Hubble trouble.'

The Cosmic Seahorse galaxy is seen through a gravitational lens in a newly released image from the James Webb Space Telescope.