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The Galaxy or The Milky way is the Sun and all stars what we see in the night skyThe number of stars in Galaxy: 1 billionThe shape of the Galaxy: It's like a huge disc with a bulge in the middle The Galaxy is about one hundred light years in diametr  Other Galaxies:There are the thousand of millions Andromeda Galaxy, The large and  small Magellanic CloudsTravel to other Galaxies:By the words of Expert travelling will be possible in huge starships But it takes much time