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 2002
COBE data
Astronomers use a variety of instruments to study the signature of the Big Bang.
By Maggie McKee, Vanessa Thomas // Published: October 28, 2002
Fraunhofer Refractor in Berlin
British astronomers had Neptune in the bag. But then they let it slip away...
By William Sheehan, Richard Baum // Published: October 27, 2002
Vesta Model
Sunlight can influence the paths asteroids take through the solar system. This animation illustrates how.
By Robert Burnham // Published: October 26, 2002
The Changing Angle of Saturn's Rings
This activity will give you close-up views of Saturn's ring system.
By Vanessa Thomas // Published: October 26, 2002
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