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The world's best-selling astronomy magazine offers you the most exciting, visually stunning, and timely coverage of the heavens above. Each monthly issue includes expert science reporting, vivid color photography, complete sky coverage, spot-on observing tips, informative telescope reviews, and much more! All this in an easy-to-understand, user-friendly style that's perfect for astronomers at any level.
Is there something we don't know about gravity?
Spacecraft flybys and the Moon's orbit aren't following predictions. Whatever is causing this could usher in a new theory of gravity.
Surprises from MESSENGER's historic Mercury flyby
The MESSENGER spacecraft flew past Mercury in October, revealing landscapes never seen up close before.
The MESSENGER spacecraft flew past the innermost planet October 6, giving scientists their second close look at Mercury in 2008.
Cassini flies through Enceladus' geysers
The Cassini spacecraft flew past Saturn's moon Enceladus twice in October, diving into its water-rich plume and imaging its dynamic surface.
How the Spitzer Space Telescope unveils the unseen cosmos
NASA's flagship infrared eye in the sky has probed hidden corners of the universe for 5 years. Spitzer chief scientist Michael Werner shares some of the telescope's greatest discoveries.
Discover galaxy groups and clusters
With an 8-inch or larger scope and a dark sky, go after these distant citizens of the cosmos.
How to build a backyard observatory
A permanent telescope setup gives you fast and easy access to the sky.
DayStar's Quantum filter reveals the Sun
With solar activity on the rise, now may be the time to invest in a Hydrogen-alpha filter.
This Month in Astronomy
Bob Berman's Strange Universe
Stephen James O'Meara's Secret Sky
The Sky this Month
Glenn Chaple's Observing Basics
Phil Harrington's Binocular Universe
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