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 ...

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 ...

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 ...

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

August nights are some of the best of the year to see the Milky Way. With no moon in the sky in the coming week, try to get out of town and treat yourself and your family to one of nature's most ...

One of the glories of the night sky is on full display this month – but hidden from many of us by the curse of light pollution. On a moonless night, take yourself far away from streetlights and other ...

(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 ...