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.
April 2003
HCG4
This collection dksplays a number of dense, interacting galaxy systems.
By Vanessa Thomas // Published: February 5, 2003
Mauna Kea in Winter
A lofty observatory site is mired in worldy problems.
By Maggie McKee // Published: February 4, 2003
Vixen 25-75x125 binoculars
Two 4.9-inch f/5 refractors power the Orion-Vixen giant zoom binoculars.
By Phil Harrington // Published: July 19, 2002
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