Astronomers witnessed two galaxies engaged in an intense deep-space battle for the first time. Watch the “cosmic joust” in action.

The second problem is that there are so many galaxies that we can only make estimates of the total number based on what we can observe in small regions of the universe.

Universe’s first galaxies unexpectedly large Galaxies bigger than ours appear less than a billion years after the Big Bang.

The number of known galaxies circling the Milky Way is increasing as we develop new powerful telescopes.

This telescope is sending back images of galaxies forming under a billion years after the Big Bang—way earlier than astronomers had previously expected.

Astronomers have observed two distant galaxies - both possessing roughly as many stars as our Milky Way - careening toward each other before their inevitable merger at a time when the universe was ...

The James Webb Space Telescope revealed galaxies from more than 13 billion years ago that seem to be as mature as the Milky Way is now: "Something so unexpected it actually creates problems for ...

Older galaxies also move around more randomly than younger ones, no matter how densely packed with energy their environments are.

Our best current theory about how galaxies form involves gravity, dark matter and mergers.