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 2006
M63
In addition to Alcor and Mizar, M51, and M101, there are plenty of other great binocular sights around the Dipper's handle. Here are a few extras to have fun with this month.
By Phil Harrington // Published: April 21, 2006
Zeta (ζ) Puppis
Find the hottest, coolest, largest, and farthest stars visible to the naked eye.
By C. Renée James, Howie Marion // Published: February 22, 2006
Cancer
Cancer is a tough crab to crack but, once spotted, it holds several interesting binocular targets.
By Phil Harrington // Published: February 20, 2006
Resources
Learn more about topics from the April 2006 issue.
Published: February 20, 2006
Book icon
Discover this month's offerings of astronomy titles.
Published: February 20, 2006
Star trails over Mauna Kea
Tonight, the stars appear to wheel around Polaris, but this won't always be so.
By Francis Reddy // Published: February 20, 2006
Gassendi sketches
Learn the importance of sketching your lunar observations.
By Martin Ratcliffe // Published: February 20, 2006
Arches
Massive stars affect their surroundings profoundly — and far more than any of their stellar brethren. Astronomers still ponder many mysteries that surround these rare beasts.
By Richard Talcott // Published: February 20, 2006
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