Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Web Extras
Go deeper into the stories of Astronomy magazine. These online features bring you additional research, interviews, photos, and more our editors turned up while creating the stories for this issue.
September 2006
NGC 6251
Large-scale flaws in general relativity could mimic dark energy's effects.
By Steve Nadis // Published: July 24, 2006
Annular eclipse (October 3, 2005)
Whether partial, total, or annular, a solar eclipse offers spectacular sights and a chance to practice your observing skills.
By Laura Layton // Published: July 24, 2006
The Very Energetic Radiation Imaging Telescope Array (VERITAS)
The coming year will be an exciting one for the field of particle astrophysics.
By Liz Kruesi // Published: July 24, 2006
Book icon
Discover this month's offerings of astronomy titles.
Published: July 24, 2006
Sagittarius
Target the Sagitta the Arrow
By Phil Harrington // Published: July 24, 2006
SEARCH SITE
Subscriber Only Access
Subscriber Only Content
Look for this icon. This denotes premium subscriber content. Learn more »
Become a Member of Astronomy.com
Register today for access to more valuable resource information.
Interact in our forums, comment on articles, receive our newsletter and much more!
Not a member?
Subscriber and Member Login
Password
Remember me