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.
May 2006
Valles Marineris
What happens when you combine a super-detailed photo of Mars' grandest canyon, 50 million altitude measurements, and powerful software? You get to fly across an alien planet.
By Richard Talcott // Published: March 24, 2006
Mars Tharsis Hemisphere
Three other worlds in the solar system appear to have features that would allow life to develop: Mars, Jupiter's icy moon Europa, and Titan. The best bet may not be what you think.
By Bashar Rizk // Published: March 24, 2006
Book icon
Discover this month's offerings of astronomy titles.
Published: March 24, 2006
Resources
Learn more about topics from the May 2006 issue.
Published: March 24, 2006
Ursa Major (Big Dipper)
In addition to the objects listed in "Big Dipper, part one," here are three more binocular targets in and around the Big Dipper's Bowl.
By Phil Harrington // Published: March 24, 2006
Darwin
Budget troubles threaten NASA's plans to search for extrasolar planets that could harbor life, but the quest is not dead yet.
By Richard Talcott // Published: March 24, 2006
dust disks surrounding black holes
While black hole kicks may seem like a crazy idea, new black hole findings can be just as bizarre.
By Liz Kruesi // Published: March 24, 2006
Asteroid impact
Think NASA has a plan for diverting an asteroid that threatens Earth? Think again.
By Bill Cooke // Published: March 24, 2006
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