Galaxies

A surprisingly complex galaxy cluster suggests that in the search for dark matter, nothing is as simple as it seems

The European Space Agency says a software patch restored stability to its cosmos-mapping Euclid spacecraft — but slower operations could extend the mission

This enormous structure could help explain processes close to the dawn of time—or it could be a random cosmic fluke

Black holes in the extraordinarily distant cosmos are out of tune with their host galaxies, offering insights into their formation

From dim red to brilliant blue, stellar colors span the spectrum—and reveal how much any star brings the heat

A new view of a record-shattering distant star shows it to be twice as hot as our sun and likely accompanied by a stellar companion

Marvel for a moment at the Milky Way’s night-sky spectacle—and the scientific revolutions it has sparked

The European Space Agency's ambitious Euclid space telescope is on its way to decoding the secrets of dark matter and dark energy

Astronomers are piecing together the final moments of supernova 2023ixf and learning more about it than any other in recent history

Voracious black holes feeding on matter in the early universe display the curious spacetime phenomenon known as time dilation

Astronomers found two colliding galaxies dating back to less than 500 million years after the big bang

The Euclid mission will probe dark energy and dark matter like never before, setting the stage for an international, multiobservatory push to solve some of the universe’s deepest mysteries