Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Issues

April 1993

Purchase this Issue
Subscribe today and save!
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. 
Features
The Titan/Triton Connection
By Ken Croswell
Saturn's Titan and Neptune's Triton couldn't look less alike. But their underlying similarities may tell astronomers much about how the outer solar system formed.
pg. 26
Toutatis seen with Radar
By Richard Talcott
This near-Earth asteroid turns out to be two boulders stuck together.
pg. 36
Counting to the Edge of the Universe
By Steven Phillipps
One million, 2 million, 3 million galaxies. It's amazing what you can learn by simply counting galaxies.
pg. 38
A New Map of the Universe
By Alan Dyer
A recent view of where galaxies lie has painted a remarkable picture of the cosmos.
pg. 44
ASTRONOMY Sky Almanac
Exploring the Virgo Cluster of Galaxies
By Robert A. Garfinkle
Hundreds of spirals and ellipticals await backyard observers of this rich nearby cluster.
pg. 56
Mare Nectaris
By Robert Burnham
Even a small telescope can take you to one of the finest impact basins on the Moon.
pg. 66
Comet Swift-Tuttle Returns
ASTRONOMY readers took striking photos of this long-lost comet.
pg. 68
The Digital Darkroom: "Printing" the Image
By Richard Berry
Use your computer to transform raw CCD images into works of beauty.
pg. 72
Departments
Behind the Scenes
Letters
Viewpoint
Insecurity Light
AstroNews
Hubble Discovers Protoplanetary Disks
Space News
Asteroid Gaspra Surprises Astronomers
Amateur News
Owners of Saturns, Meet Saturn
Reader Reports
Fast Asteroids and Dark Eclipses
Astronomy Books
AstroBytes
Deep Space 3-D
New Astronomy Products
Meetings and Events
Readings and Credits
Advertiser Index
SEARCH SITE
Subscriber Only Access
Subscriber Only Content
Look for this icon. This denotes premium subscriber content. Learn more »
Become a Member of Astronomy.com
Register today for access to more valuable resource information.
Interact in our forums, comment on articles, receive our newsletter and much more!
Not a member?
Subscriber and Member Login
Password
Remember me