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.
August 2011
antihydrogen-atom
CERN scientists have produced and captured antihydrogen atoms.
By Liz Kruesi // Published: June 27, 2011
Pioneer-Venus
Some scientists think acid rain may not be the oddest form of precipitation on Venus. And on Saturn, researchers can’t measure precise wind speeds because they don’t know how fast the planet rotates.
By Michael Carroll // Published: June 27, 2011
The zodiacal light

You’ll impress family and amateur astronomers alike with your knowledge of these astronomical concepts.

By Michael E. Bakich // Published: June 27, 2011
Cosmic-Question-Mark

These 50 queries will test your knowledge of astronomy trivia.

By Michael E. Bakich // Published: June 27, 2011
Astronomy-staff
What initiated the magazine staff’s interest in space and astronomy?
By Liz Kruesi // Published: June 27, 2011
golden-ratio

Be they useful, powerful, or beautiful, these relationships represent a few of the staff's favorite things about science.

By Bill Andrews // Published: June 27, 2011
M13 and M92 sketches

Capturing what you observe on paper is a great way to compare M13 and M92.

By Glenn Chaple // Published: June 27, 2011
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