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Killer collaboration

New images of a quartet of galaxies combine the efforts of Chandra, Spitzer, and two amateur astrophotographers

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Earth cousin?

The first Earth-sized planet found in the habitable zone of its star

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Starmus 2014 Rocks Astronomy!

Join astronomy’s greatest minds in the Canary Islands, September 22–27, 2014. New speakers continue to be announced!

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COSMOS Hangouts

Get expert insights on each episode

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Sharing totality

Check out all the lunar eclipse photos in our Online Reader Gallery

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Introducing Cosmic Origins!

Our one-of-a-kind interactive app puts the universe at your fingertips!

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Student Story Contest!

Enter to win a copy of David A. Aguilar's new book!

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New moon?

A new small icy object discovered within the rings of Saturn

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Supermassive surprise

First pair of black holes in orbit around each other in a quiescent galaxy

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Cosmic Adventures

Animals launched into space

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Uwingu Mars

Name a crater ... make an impact!

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Killer collaboration

New images of a quartet of galaxies combine the efforts of Chandra, Spitzer, and two amateur astrophotographers

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PICTURE OF THE DAYsee all »

The Heart Nebula

The Heart Nebula (IC 1805) is a large emission nebula in the constellation Cassiopeia the Queen. It lies some 7,500 light-years from Earth. (4-inch Takahashi FSQ-106ED refractor at f/5, SBIG STL-11000M CCD camera, Hydrogen-alpha/LRB image with exposures of 10, 10, 5, and 5 minutes, respectively)
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