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Habitable-zone hunt

For the first time, an Earth-sized planet has been found in the habitable zone of its star

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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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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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Meet Mars

The Red Planet reaches its peak in the constellation Virgo this month

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New moon?

A new small icy object discovered within the rings of Saturn

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Introducing Cosmic Origins!

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

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Astronomy on DVD!

Bring the cosmos to your computer!

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Student Story Contest!

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

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Exact expansion

The most precise measurement yet of cosmic expansion

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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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Habitable-zone hunt

For the first time, an Earth-sized planet has been found in the habitable zone of its star

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PICTURE OF THE DAYsee all »

Xi Cygni and nebulosity

This image shows part of the North America Nebula (NGC 7000) in the constellation Cygnus the Swan. The orange supergiant Xi Cygni (also known as 62 Cygni) is the central star, together with the “west coast” of NGC 7000. (2.4-inch Takahashi FS-60C refractor at f/6.2, Quantum Scientific Instruments QSI 540wsg CCD camera, Hydrogen-alpha/RGB image with exposures of 60, 10, 10, and 10 minutes, respectively)
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