NASA's shuttle Discovery heads to space station on its final mission Astronomy Magazine
Updated: 2011-02-26 13:18:33
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CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
The Chooz Nuclear Power Plant in the Ardennes region of France produces more than just electricity. It produces neutrinos that may help scientists solve some of the biggest mysteries in the universe.
: , , CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests
CURRENT ISSUE THE MAGAZINE Current Issue Next Issue Back Issues Preview the Magazine Special Issues E-mail Newsletter About the Magazine Subscribe , Renew or Give a Gift Subscriber Benefits Trips Tours Advertise Advertiser Links Sweepstakes Press Room Contact Us COLUMNISTS Bob Berman Glenn Chaple Tony Hallas David H . Levy Stephen James O'Meara NEWS OBSERVING Astronomy News Liz and Bill's Cosmic Adventures StarDome Plus Intro to the Sky Astronomy for Kids Urban Skies Astronomy Myths The Sky this Week The Sky this Month Star Atlas Ask Astro Astro Imaging Constellation Observing Glossary EQUIPMENT Products Reviews How To MULTIMEDIA Picture of the Day Reader Photo Gallery Videos Podcasts Wallpaper COMMUNITY Why Join Blog Astronomy Groups Astronomy Events Forums Astronomy Day Contests SHOP
Starting Feb. 11, photography exhibits will open in Asia, Europe and North America to showcase images from the first Global Particle Physics Photowalk. 
What is a Galaxy?
“Any of the numerous large groups of stars and other matter that exist in space as independent systems.” (OED)
“A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark [...]