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.
January 2010
Jim Head
Jim Head is the Louis and Elizabeth Scherck Distinguished Professor of Geological Sciences at Brown University in Providence, Rhode Island.
By Karri Ferron // Published: November 23, 2009
A Loopy Solar Prominence
Associate Editor Liz Kruesi
Published: November 23, 2009
January 2010 winter gallery-NGC2359
These beautiful images will make your eyes water without cold weather.
By Michael E. Bakich // Published: November 23, 2009
Avi Loeb
Avi Loeb is a professor at Harvard University and the director of the Institute for Theory and Computation of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts.
By Karri Ferron // Published: November 23, 2009
January 2010  gallery-Bug Nebula
Browse a sample of these interesting sky-targets, and then seek them out with your own telescope.
By David J. Eicher // Published: November 23, 2009
January 2010 solar filter
The dangers of these accessories cracking from the Sun's heat proved to be more than just a cosmic legend.
By Glenn Chaple // Published: November 23, 2009
January 2010 UK Schmidt Telescope
A southern-sky survey mapped more than 110,000 nearby galaxies to show cosmic structure.
By Liz Kruesi // Published: November 23, 2009
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