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 2008
M13
Here's how to find some of summer's brightest objects.
By Michael E. Bakich // Published: May 25, 2008
NGC 6646
This classic from the summer of 1989 profiles faint galaxies and hidden treasures within the constellation Lyra.
By Brian Skiff // Published: May 24, 2008
aperture-masking interferometry
Astronomers enjoy incredibly detailed views of distant objects with a technique for turning one telescope into many.
By Daniel Pendick // Published: May 24, 2008
Stonehenge
Monuments like Stonehenge were ancient efforts to grapple with the nature of time. But how well do we understand this enigmatic dimension today?
By Francis Reddy // Published: May 24, 2008
Scorpius and Ophiuchus
Here's two globular cluster and a brief binocular-observing calendar.
By Phil Harrington // Published: May 24, 2008
Global Weather
A consortium of European nations will launch a probe in 2013 to search for life on Mars.
By Daniel Pendick // Published: May 24, 2008
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