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 2012
Scorpius
Imagers who specialize in wide-field views provide superb images of the constellations.
By Michael E. Bakich // Published: February 27, 2012
Movement of stars
Using decades of observations of stars at the Milky Way’s center, scientists know the mass of the black hole … and they’ve also created an animation illustrating how those stars move.
By Liz Kruesi // Published: February 27, 2012
Formation_08
How well can you recognize your home planet’s landscape?
By Bill Andrews // Published: February 27, 2012
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