NASA’s Chandra X-ray Observatory and Hubble Space Telescope have been used to study a cluster of stars, nicknamed “Nikhuli," ...

In the search for habitable exoplanets, atmospheric conditions play a key role in determining if a planet can sustain liquid ...

Galaxy merger Arp-Madore 417-391 is on display in this new image captured by the Hubble Space Telescope's Advanced Camera for ...

The James Webb Space Telescope has captured infant stars carving peaks of dust and gas in the Pismis 24 star cluster.

Astronomers tracked the strangest gamma-ray burst yet. GRB 250702B is a repeating, day-long flash unlike anything seen before ...

I/ATLAS is a fast, ancient interstellar object. Its odd features fuel both scientific study and speculation. On July 1, ...

But over the summer, 3I/ATLAS, has plunged toward the inner solar system—and the fireworks show has begun in earnest. When ...

A newly discovered distant object that astronomers have dubbed “The Cliff” could solve a riddle posed by some of the first ...

The dwarf planet Pluto and its five known natural satellites (Charon, Styx, Nix, Kerberos, and Hydra) may be frigid, but ...

Though NGC 7456 looks like a modest spiral galaxy, new Hubble and XMM-Newton observations reveal a bustling system with ...

Hubble has uncovered a rare ultra-massive white dwarf created in a violent star merger. Once thought to be ordinary, the star ...

Astronomers discovered a repeating, day-long gamma-ray burst, challenging theories of star deaths and black holes.