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.
March 2003
See how a neutron star forms.
By Jeremy McGovern // Published: January 7, 2003
mars polar lander
Had NASA's Mars Polar Lander successfully landed and completed its mission objectives, our understanding of the Red Planet's climate would have dramatically increased.
By Jeremy McGovern // Published: January 7, 2003
Global View of Mars
An international observing program keeps a close eye on Mars.
By Daniel Troiani // Published: January 6, 2003
Lagoon Nebula (M8)
Run through these tricks of the CCD trade and you'll be capturing digital sky images in no time.
By Gregory Terrance // Published: November 8, 2002
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