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.
June 2004
John Philip Sousa
Listen to the John Philip Sousa march inspired by the 1882 transit of Venus.
By Jeremy McGovern // Published: April 28, 2004
Arizona Sky Village
One way to get a dark sky is to buy a house that has it already.
By Tom Polakis // Published: April 26, 2004
Mariner 4: first glimpse of Mars
Exploring Mars by spacecraft destroyed an entire world that existed only in humankind's imagination — and it gave us a real world loaded with complexities.
By Robert Burnham // Published: April 26, 2004
Some of the most famous episodes of astronomical history were written right here.
By Matt Quandt // Published: April 26, 2004
47 Tuc zoom
Fly from Earth into the core of the dense globular cluster 47 Tucanae.
By Richard Talcott // Published: April 26, 2004
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