A galaxy 600 million light-years away appears to be trailing gas in a string 1.2 million light-years long, but explaining its origins presents a challenge.
Deep-sky objects may appear static throughout our lifetime but by carefully "blinking" archival and current images we can discern real changes in their appearance.
Astronomers have long suspected that a distant quasar harbors not one but two supermassive black holes. They've now detected OJ 287's second black hole.
In the JWST version of the Hubble Deep Field, astronomers are discovering what galactic life was like in the earliest years of the universe.
JWST images of early galaxies have turned up a population of flat, red disks that may have been entirely missed by previous surveys.
An unusual streak of stars thought to have formed in the wake of a wandering supermassive black hole might just be a spiral galaxy seen edge-on.
New JWST images reveal that one of the most distant objects ever observed is actually two baby galaxies on a possible collision course.
Astronomers analyzed the gravitationally lensed image of a distant galaxy to test the nature of dark matter.
JWST's detection of early galaxies that are far more massive than astronomers had expected could mean we need to rewrite our understanding of the cosmos.
James Webb Space Telescope images reveal an intricate network in nearby galaxies, influenced by generations of star formation.
Astronomers are using compact groups of stars to probe the history of a galaxy in the adolescent universe dubbed "The Sparkler."
Three dwarf galaxies around the Sculptor Galaxy have come to light thanks to the work of an amateur astronomer.
An arc that glows green thanks to doubly ionized oxygen appears near the Andromeda Galaxy in a photo obtained by amateur astronomers.
Astronomers have discovered that one of the Milky Way’s nearest galactic neighbors has dramatically changed its looks in the recent past.