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Galáxias em anel... Hoag's Object: A Strange Ring Galaxy http://antwrp.gsfc.nasa.gov/apod/ap100822.html Explanation: Is this one galaxy or two? This question came to light in 1950 when astronomer Art Hoag chanced upon this unusual extragalactic object. On the outside is a ring dominated by bright blue stars, while near the center lies a ball of much redder stars that are likely much older. Between the two is a gap that appears almost completely dark. How Hoag's Object formed remains unknown, although similar objects have now been identified and collectively labeled as a form of ring galaxy. Genesis hypotheses include a galaxy collision billions of years ago and the gravitational affect of a central bar that has since vanished. The above photo taken by the Hubble Space Telescope in July 2001 reveals unprecedented details of Hoag's Object and may yield a better understanding. Hoag's Object spans about 100,000 light years and lies about 600 million light years away toward the constellation of the Snake (Serpens). Coincidentally, visible in the gap (at about one o'clock) is yet another ring galaxy that likely lies far in the distance. Ring Galaxy AM 0644-741 from Hubble http://antwrp.gsfc.nasa.gov/apod/ap051022.html The Cartwheel Galaxy http://antwrp.gsfc.nasa.gov/apod/ap010612.html Barred Spiral Galaxy NGC 1300 http://antwrp.gsfc.nasa.gov/apod/ap080622.html Ring Galaxy AM 0644-741 from Hubble http://antwrp.gsfc.nasa.gov/apod/ap040426.html --- Beijins Fa ---------------------------------------------------------------- "Aquele que luta contra a corrente pode morrer eletrocutado." ---------------------------------------------------------------- ------------------------------------ << Não leve nada pro lado pessoal. Apenas divirta-se. >> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/goldenlist-L/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/goldenlist-L/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
