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.
October 2011
Moon_011811
Learn about lunar geology with sights you can target with your telescope.
By Michael E. Bakich // Published: August 29, 2011
J. Dana Hrubes
A scientist who has spent six winters at the coldest continent tells us what it's like.
By Liz Kruesi // Published: August 29, 2011
Hartley

Astronomers continue learning about these ancient icy wonders and have gotten near enough to capture video of these objects up close.

By Bill Andrews // Published: August 29, 2011
06_helix
This planetary nebula offers a great show through the eyepiece.
By Liz Kruesi // Published: August 29, 2011
NGC2835
Associate Editor Liz Kruesi
Published: August 29, 2011
Abell-2151
Some cosmologists think the Big Bang was a single event in an infinite cycle.


By Richard Talcott // Published: August 29, 2011
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