Galaxies

The "peculiar," twisted galactic disk of the "trainwreck" lenticular galaxy NGC 4753 offers evidence of its violent collision with a dwarf galaxy over 1 billion years ago.

The motions of satellites in galaxy groups tell us that such groupings, and therefore possibly the universe, are younger than what standard cosmology tells us.

This galactic superstructure appears to us as it was over 9 billion years ago.

NASA's forthcoming Nancy Grace Roman Space Telescope will zoom in on streams of stars in the Andromeda galaxy to hunt for dark matter.

The Hubble Space Telescope zoomed into a galaxy 150 million light years away to study a supernova that released 2.5 billion times more energy than the sun, resulting in a stunning image.

Directly mapping the Milky Way is an extremely challenging task, but observations of other galaxies helped us piece together what our home galaxy looked like.

An unexpected and unexplained gamma-ray signal from beyond the Milky Way found among 13 years of NASA Fermi Telescope data could be linked to another cosmic mystery.

Astronomers inadvertently discovered a "dark" galaxy rich in gas but lacking stars when they pointed the Green Bank Telescope in the wrong direction.

Mysterious "odd radio circles" or ORCs that compass entire galaxies may have finally been explained, with astronomers pointing the finger at winds from bursts of supernova star explosions.