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.
October 2007
New CMB data
In 1950, two young physicists estimated the cosmic microwave background's temperature — and nearly got it right.
By Francis Reddy // Published: August 27, 2007
Asteroid surfaces
An asteroid's color reveals the effects of space weathering.
By Laura Layton // Published: August 27, 2007
20th Anniversary of SN 1987A
Astronomers feel confident SN 1987A left behind a rapidly spinning neutron star. Despite extensive searches and a few false detections, however, the quest to find it has turned up empty.
By Richard Talcott // Published: August 27, 2007
Light pollution above Quebec City
There is plenty to see, despite the glare of light pollution.
By Daniel Pendick // Published: August 27, 2007
IC 1396
Use this software and your Meade telescope to observe all the objects listed in Astronomy's October 2007 issue.
By Michael E. Bakich // Published: August 27, 2007
Aquarius
Explore John Raymond's stellar triangles and star chains that collectively form the "waters of Aquarius."
By Phil Harrington // Published: August 27, 2007
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