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How to view Comet ISON in October

Mars points the way to this celestial visitor as it brightens before dawn during the first half of the month

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COMET ISON

The definitive guide to what, when, where, and how!

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B-mode breakthrough

Telescopes find elusive signals from the early universe

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GET IT NOW!

Download Astronomy magazine on the App store!

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NASA down

What the government shutdown means for NASA and you

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Uranus at its best

How to view the ice giant at its
2013 peak

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Norway Northern Lights Cruise

Join Astronomy magazine this November on a tour of Norway’s coastal winter wonderland and experience the electrifying aurora borealis

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Astronomy on DVD!

Bring the cosmos to your computer!

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Comet ISON's reality

What we really know about how ISON will perform this fall

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How to view Comet ISON in October

Mars points the way to this celestial visitor as it brightens before dawn during the first half of the month

Get the details »

PICTURE OF THE DAYsee all »

Comet LINEAR meets a galaxy

Comet C/2012 V2 (LINEAR) passed the bright spiral galaxy NGC 2997 in the southern constellation Antlia the Air Pump on September 29. At the time, the comet was 17 light-minutes away while NGC 2997 was 38 million light-years from Earth. (4.3-inch refractor at f/5.6, SBIG STL-11000 CCD camera, LRGB image with exposures of 15, 2, 2, and 2 minutes, respectively, taken September 29, 2013, at 18h19m UT)
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