How Many galaxies Are There

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Scattered throughout the universe are vast islands of stars,called galaxies.our Sun is a star in the milky way galaxy.This is our galaxy,too,and it has a billions of stars in it.It takes light about one hundred thousand years to go from one end of our galaxy to the other (and light travels about six million million miles in one year !)
     Astronomers have discovered through the use of telescope that there are millions of galaxies beyond our own. There are basically shape (like our own Milky Way) are called spiral galaxies .The one nearest to us is about two millions light-years away .It is the great spiral galaxy in the constellation Andromeda.
          About 17 per cent of the brightest galaxies that have been observed are called elliptical galaxies . ( An ellipse Is like a stretched-out circle ) These galaxies contain mostly stars and seem to have little or no dust gas
      Some galaxies are called irregular galaxies because they appear to have no speacial shape .These galaxies contain stars, dust and gas. The two galaxies nearest the milky way are irregular galaxies
     There are also some small galaxies that are called dwarf galaxies. The smallest are only a few hundred light-years across and contain only a few thousand stars. There may be more dwarf galaxies in the universe than larger ones .

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