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Galaxy
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 universeSentences:
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/worldbook/wbkids/k_galaxy.html
http://www.nasa.gov/worldbook/wbkids/k_milkyway.html
http://www.nasa.gov/mission_pages/hubble/science/hst_img_20080424.html