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.
February 2004
Flying a supersonic jet may seem an unconventional choice for astronomical discovery, but it was the best platform available to search for a possible asteroid belt lurking inside Mercury's orbit.
By Dan Durda, S. Alan Stern // Published: January 12, 2004
This timeline describes several bright supernovae witnessed by astronomers over the past millennium.
By Robert Burnham // Published: December 29, 2003
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