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 2011
03_Tyagaraja-Crater
Since the MESSENGER spacecraft entered orbit around the innermost planet in March, it has returned a treasure-trove of images and other data to eager scientists on Earth.
By Richard Talcott // Published: October 27, 2011
Palomar-observatory
The Golden State has many places for an astronomy fan to visit.
Published: October 24, 2011
07_NGC-1555

Browse images of beautiful winter deep-sky objects you can target with telescopes of various sizes.

By Michael E. Bakich // Published: October 24, 2011
Moon
NASA’s videos of its two famous lunar probes help provide a better sense of their abilities and accomplishments.
By Bill Andrews // Published: October 24, 2011
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