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Galaxy
 
This artist's concept illustrates the new view of the Milky Way

Using infrared images from NASA's Spitzer Space Telescope, scientists have discovered that the Milky Way's spiral has just two arms wrapping off the ends of a central bar of stars. Scientists had thought that the Milky Way had four major arms. Image Credit: NASA

      one of the very large groups of stars and other matter that are found throughout the universe




Sentences:
Earth is a planet in the Milky Way Galaxy.

NASA scientists have found many other galaxies in the universe.



More Information:
http://www.nasa.gov/mission_pages/hubble/science/hst_img_20080424.html