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.
September 2008
Armillary
Why don't astronomers simply say "ascension"?
Published: July 25, 2008
Flame prominence
See two movies of the Sun from the Hinode observatory.
Published: July 25, 2008
X Cygni and a handful of the Swan's residents provide additional challenges for September binocular observers.
By Phil Harrington // Published: July 25, 2008
Numerical relativity researcher Manuela Campanelli describes the culminating moments of the merger of two black holes.
By Daniel Pendick // Published: July 25, 2008
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