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.
November 2007
Triangulum
Three objects within Triangulum are well worth visiting through your binoculars.
By Phil Harrington // Published: September 24, 2007
Georges Lemaître and Burroughs E 101
The Belgian priest loved crunching numbers, and he embraced technology that helped him do it.
By Francis Reddy // Published: September 24, 2007
See what astronomers are talking about with these animations of black holes.
By Francis Reddy // Published: September 24, 2007
Watch these stars' brightnesses change before your very eyes.
By Michael E. Bakich // Published: September 24, 2007
Lake Cheko
Researchers may have discovered a previously unknown scar from the 1908 Tunguska meteor explosion: a deep crater lake.
By Daniel Pendick // Published: September 24, 2007
Eye anatomy
Don't be reluctant to "interview" your doctor before you have LASIK or other vision-correction procedures.
By Daniel Pendick // Published: September 24, 2007
Images from orbit highlight striking similarities between Earth and Titan.
By Daniel Pendick // Published: September 24, 2007
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