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.
April 2007
NGC 3628
Northern California observer Steve Gottlieb lists more than a dozen targets awaiting you at the eyepiece.
By Laura Layton // Published: February 19, 2007
Follow NASA's New Horizons mission as it whisks past Jupiter.
By Francis Reddy // Published: February 19, 2007
R Leonis map
Take a binocular tour of R Leonis' neighborhood.
By Phil Harrington // Published: February 19, 2007
Animation shows the energetic region near a massive object's point of no return.
By Michael E. Bakich // Published: February 19, 2007
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