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.
September 2004
Phoebe near closest approach
See more fantastic images of the ringed planet and its moons.
Published: July 27, 2004
Benjamin Gould made enemies, but astronomy is much richer thanks to his dedication and energy.
By Matthew Terry // Published: July 27, 2004
M33
OK, you did the easy items — here are a few to test your observing skills.
By Ian Ridpath // Published: July 27, 2004
Oregon Star Party
What to bring &#151 and what not to bring &#151 to the Oregon Star Party.
By Matthew Quandt // Published: July 27, 2004
Make your own estimate for the number of communicative civilizations in the Milky Way.
Published: July 27, 2004
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