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.
April 2013
Galaxy group merger
Although the Milky Way’s scheduled collision with the Andromeda Galaxy in a few billion years may be the most spectacular galaxy smash-up on our horizon, it’s not the only cosmic crash astronomers have studied. Watch these computer simulations for a taste of what gravity can fashion.
By Richard Talcott // Published: February 26, 2013
Nagler-eyepiece
Tele Vue’s introduction of the Nagler eyepiece in 1980 started a revolution in high-quality optics.
By Michael E. Bakich // Published: February 26, 2013
John-Herschel_Cape-Notes

Read a few excerpts from the great astronomer's journal from studying the Southern Hemisphere skies.

By Karri Ferron // Published: February 25, 2013
05_NGC-6910
Bernhard Hubl has photographed everything from Messier objects to obscure galaxy clusters, but those off the beaten path are his favorite.
By Karri Ferron // Published: February 25, 2013
String-Theory
For superstring theory to work, our cosmos must have another six dimensions. Where are they hiding?
By Liz Kruesi // Published: February 25, 2013
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