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 2003
A computer simulation mimics the experience.
By Michael E. Bakich // Published: August 5, 2003
By David Helfand // Published: August 5, 2003
David Helfand
The practice of tenure in academia has both pros and cons.
By Maggie McKee // Published: August 5, 2003
martian chronicles
Twentieth century pop culture provides an array of American views on the Red Planet.
By Jeremy McGovern // Published: June 4, 2003
Mariner 4: first glimpse of Mars
This timeline chronicles mankind's attempts to get a closer look at the Red Planet.
By Matt Quandt // Published: June 3, 2003
Pathfinder Landing Site
Here is the equipment you'll need to see details on the Red Planet's surface.
By Richard Talcott // Published: May 7, 2003
Coprates Chasma
Recent discoveries paint Mars as an active planet with erupting volcanoes and underground rivers.
By William K. Hartmann // Published: July 25, 2001
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