Get started on a journey of discovery and wonder! Astronomy for Kids » Intro to the Sky » Urban Skies » Equipment » Glossary » Astronomers say it's possible to spot volcanoes on alien worlds An eruption sends out fumes and various gases, so volcanic activity on a rocky exoplanet might leave a telltale atmospheric signature. Recent Articles Galactic tendrils shed light on evolution of spiral galaxies 09/08/2010 Two asteroids pass by Earth Wednesday 09/08/2010 Fundamental constant might change across space 09/07/2010 More news » News Feed | What is RSS? Tour the solar system: Mercury In the first installment of the "Tour the solar system" series, Associate Editor Liz Kruesi explores what scientists know about the innermost planet and what they're still hoping to learn in the future. Video categories Product showcase Astronomy update How to Trips and tours General See more videos » Keep our skies secure, too 09/07/2010 10:30 AM Celestron and Granite Gap team up for dark skies 09/02/2010 10:40 AM Falling stars: Remembering Jack Horkheimer … a personal perspective 08/30/2010 12:58 PM Observing podcast: Belt of Venus, the Magic Carpet Nebula, and emission nebula IC 1396 September 2-9, 2010: The Belt of Venus makes a nice target for beginning observers, while the Magic Carpet Nebula and emission nebula IC 1396 provide nice targets for telescope owners. Listen Subscribe to podcast » Podcast archive » Astronomy magazine subscribers have exclusive access to this premium content and more. Share your opinions and images or get advice from other Astronomy.com members. Go » Which do you use most to observe the sky? Binoculars Small telescope (smaller than 4 inches) Medium telescope (4-8 inches) Large telescope (bigger than 8 inches) Naked eyes    Show Results » Customer service » Letter to the editor » Submit a group or event »