A nearby active galaxy called VV 340a offers a dramatic look at how a supermassive black hole can reshape its entire host.

New research shows weak black hole activity in red geyser galaxies prevents star formation despite ample gas, using observations of inflows, outflows, and galaxy interactions.

Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our noses all this time. Models of how the universe has evolved since the Big ...

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short of the total matter produced in the Big Bang 13.6 billion years ago. In ...

The Andromeda Galaxy, the Milky Way's closest galactic neighbor, glows brightly in a new Hubble Space Telescope image with swathes of ionized gas that fuel star formation. When you purchase through ...