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 2007
M13
Leading off with M13, take a tour of these deep-sky gems with your Meade go-to telescope.
By Michael E. Bakich // Published: March 23, 2007
Millenium Run simulation
Watch 10 billion particles evolve into 20 million galaxies in this movie of the Millennium Run simulation.
By Laura Layton // Published: March 23, 2007
Here are a few other objects in Canes Venatici that are worth hunting for through your binoculars.
By Phil Harrington // Published: March 23, 2007
The CMB's origin
Put the universe's "earliest light" in perspective.
By Francis Reddy // Published: March 23, 2007
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