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 2009
Milky Way (GLIMPSE/MIPSGAL)
Two infrared surveys conducted by the Spitzer Space Telescope have revealed the Milky Way like never before.
By Richard Talcott // Published: November 24, 2008
Galaxy Arp 220 magnetic fields
Associate Editor Daniel Pendick says the dynamo mechanism may be a small part of the answer.
Published: November 24, 2008
Moon, Venus, Mars on 14 May 2002, 22:49 PDT
Mark your calendar for these 10 sightings in the first half of the New Year.
By Phil Harrington // Published: November 24, 2008
International Year of Astronomy 2009
The Astronomy contributing editor shares six goals for the International Year of Astronomy.
By Glenn Chaple // Published: November 24, 2008
Area I-X
Major astronomy and space events planned for 2009 include the first major test of the space shuttle replacement, a rendezvous of the Dawn spacecraft with Mars, and the launch of a roving laboratory to the Red Planet.
By Daniel Pendick // Published: November 24, 2008
Iris Nebula (NGC 7023)
Download a list of the 158 reflection nebulae that Sidney van den Bergh catalogued.
By Michael E. Bakich // Published: November 24, 2008
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