A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...

Inside the bright but unassumingly named nebula Gum 55 lies a dark nebula — a rift of dust grains that absorb visible light — creating a swatch of darkness against the glow of bright gas. Fittingly ...

The Andromeda galaxy helped Edwin Hubble settle a great debate in astronomy. Stocktrek Images via Getty Images A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known ...

The Milky Way nebula RCW 36 resembles a stunning cosmic bird of prey in an incredible Very Large Telescope image.

A rare black moon will happen tonight Aug. 22-23. A seasonal black moon happens every 33 months. Since a black moon is a new moon, you might be able to spot the Milky Way and the dumbbell nebula. A ...

Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. The Andromeda galaxy is the galaxy next door, a very faint, fuzzy thing ...

This image shows a collection of 25 new space images celebrating the Chandra X-ray Observatory's 25th anniversary. Starting from the upper left, and going across each row, the objects imaged are: Crab ...

Astrophotographer Emil Andronic captured a gorgeous blue reflection nebula glowing inside the red clouds of Orion's Head in the constellation Orion.

An 8th-grade astrophotographer from Apple Valley captured a stunning image of the Bubble Nebula, 7,000 light-years away.

Summer in the Northern Hemisphere is a frustrating time for many amateur astronomers. The nights never get dark enough to easily see the faint, fuzzy galaxies and nebulae they enjoy looking at through ...

Each spring, amateur astronomers attempt the ultimate stargazing challenge—an overnight quest to spot every galaxy, nebula, and star cluster in Charles Messier’s famous catalog. Photographer Alan Dyer ...

(THE CONVERSATION) A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by ...