A planet's light curve gives important clues to its composition.
By Anthony Mallama
Where Did Earth's Water Come From?
The evidence of ice in asteroids indicates that there may be much more water in the solar system than previously thought.
By Kristina Grifantini
Hot New Products for 2011
Out 13th annual roundup highlights the year's most important new astronomy gear.
By The editors of [i]Sky & Telescope[/i]
The author explores the deep-sky wonders of an extinct constellation: the Flying Squirrel.
By Sue French
BEYOND THE PRINTED PAGE
An Astronomer's Guide to Holst's The Planets
A music expert describes the influences on and legacy of Gustav Holst's most famous composition. Click here to read the complete article, or find links to performances of The Planets.
By James Reid
ALSO IN THIS ISSUE
A "Double-Double" of Galaxies
These challenging galaxy pairs in Aries will test your observing mettle.
By Ken Hewitt-White
Planets in the Morning
Venus, Mercury, and Saturn put on a fine show at dawn.
By Fred Schaaf
Treasures from the Archives
The author describes some ground-breaking amateur-telescope making articles from 1976 to 2000.
By Gary Seronik
Weathering new Worlds
A meeting of astronomers and climate modelers will lead to better predictions.
By David Grinspoon
Table of Contents
See what else January's issue has to offer.