The History of Water on Mars
How many times has NASA discovered water on Mars? We set the record straight.
By Emily Lakdawalla
Solving the Quasar Puzzle
Fifty years ago, recently discovered "radio stars" began revealing their exotic secrets.
By Bradley Peterson
In Europe, many amateurs are engaging in professional-level research.
By Jan Hattenbach
An Astronomical Revival
In western North Carolina, philanthropists have revamped a former military satellite-tracking station, turning it into a leading hands-on astronomy education center.
By Ashley Yeager
Eyepieces: Windows on the Universe
Understanding the basics will help you select from the cornucopia of modern eyepieces.
By Alan French
Piecing Together the Sun & Moon
Here's an easy technique for creating expansive images of the Sun and Moon using modest sensors.
By Tim Jensen
BEYOND THE PRINTED PAGE
Water on Mars: A Gallery
Orbiters and landers offer tantalizing vistas of water on Mars.
By Robert Naeye
Resources for the Amateur Spectroscopist
Check out these links to learn more about taking spectra of the stars.
By Robert Naeye
Comet ISON Updates
Keep up to date with the latest developments on the "comet of the century."
By Alan MacRobert
Librations and other lunar data for September 2013
By Sean Walker
ALSO IN THIS ISSUE
Several celestial objects pass near to one another on the sky and in space.
By Fred Schaaf
Comet ISON Approaches
The "comet of the century" was stuck at 16th magnitude when it hid out for the summer. Even so, good prospects remain for December.
By John E. Bortle
Stalking the "False Dawn"
To see the elusive zodiacal light during September and October, you'll need dark, crystal-clear skies — and an alarm clock.
By J. Kelly Beatty
Table of Contents
See what else September's issue has to offer.