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.
July 2002
A TIE user in Great Britain shares his experiences with the program.
By Vanessa Thomas // Published: May 29, 2002
Cassini and Centaur rocket
Pictures of "space dumps"
By Vanessa Thomas // Published: May 28, 2002
The creation of the Hertzsprung-Russell diagram was a landmark advance in our understanding of the stars.
By James Trefil // Published: May 28, 2002
An explanation of how the universe's expansion was at first slowed down by gravity and then began to accelerate
By Vanessa Thomas // Published: May 27, 2002
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