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.
February 2005
Blue Saturn
See the images returned from Cassini as it makes its way around Saturn.
Published: February 22, 2005
Einstein@Home
A home computer can run a screen saver that will help astrophysicsts detect gravitational radiation.
By Robert Burnham // Published: December 27, 2004
Diamond ring effect
"Mr. Eclipse" recounts his favorite total solar eclipses.
By Fred Espenak // Published: December 27, 2004
Albert Einstein
Einstein didn't conceive it in the form you know.
By Robert Burnham // Published: December 27, 2004
The Red Rectangle
Enjoy Hubble shots of familiar planetary nebulae.
Published: December 27, 2004
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