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 2009
Lisa Randall
Learn more about the lives and ideas of April's "Astro Confidential" professionals.
By Karri Ferron // Published: February 23, 2009
Chandra X-ray Observatory
Associate Editor Daniel Pendick explains how X-ray telescopes work.
Published: February 23, 2009
April 2009 colliding branes
The cyclic theory of the universe proposes a novel answer to the question: What happened at the Big Bang?
By Richard Talcott // Published: February 23, 2009
April 2009 Coma Star Cluster finder chart
In addition to the objects discussed in this month's "Binocular Universe" column, here are a few more binocular targets in and around Coma Berenices.
By Phil Harrington // Published: February 23, 2009
April 2009 WE pie chart wmap
Scientists still can't account for about 40 percent of the stuff of stars, planets, and people.
By Daniel Pendick // Published: February 23, 2009
April 2009 WE Orion's Starblast 6
See why Contributing Editor Glenn Chaple thought this grab-and-go telescope is great for first-time buyers.
By Michael E. Bakich // Published: February 23, 2009
Lagoon Nebula (M8)
View a mix of solar and deep-sky images taken by a master.
By Michael E. Bakich // Published: February 23, 2009
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