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 2007
Galaxy Merger Animation
Watch as a massive galaxy steals stars away from a diminutive satellite.
By Laura Layton // Published: June 25, 2007
Lagoon Nebula
Plan your observing using the catalog of American astronomer Stewart Sharpless.
By Michael E. Bakich // Published: June 25, 2007
Sagittarius
Sagittarius holds far more than a month's worth of binocular treasures for observers to enjoy.
By Phil Harrington // Published: June 25, 2007
USNO superchip
USNO's "to do" list includes bigger and better star catalogs and more-accurate atomic clocks.
By Geoff Chester // Published: June 25, 2007
Milky Way
The 4,200-year-old temple unearthed at Buena Vista, Peru, is aligned with the dark-cloud figure of the Fox, but how old is the constellation?
By Robert Benfer // Published: June 25, 2007
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