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.
December 2008
Mars
Associate Editor Daniel Pendick explains why Mars is referred to as the red planet.
Published: October 27, 2008
Cetus chart
Use surrounding star magnitudes to figure out this variable star's brightness.
By Phil Harrington // Published: October 27, 2008
The Antares region
Explore an astounding image of the Antares region.
By Michael E. Bakich // Published: October 27, 2008
Summer Milky Way
Anthony Ayiomamitis shares 10 more of his celestial images, and we take a trip through Athens with Editor David J. Eicher.
By Michael E. Bakich // Published: October 27, 2008
Backyard observatory
What to consider when storing your equipment if you don't have a backyard observatory.
By Glenn Chaple // Published: October 27, 2008
Earth
Watch a video of the ecosystem along the hydrothermal vents of the Galápagos Rift.
By Daniel Pendick // Published: October 27, 2008
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