<span>So far, astronomers have found more than 500 solar systemsand are discovering new ones every year. Given how many they have found in our own neighborhood of the Milky Way galaxy, scientists estimate that there may be tens of billions of solar systems in our galaxy, perhaps even as many as 100 billion.</span>
The U.S. wanted to prevent the spread of communism.
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they depend upon the type of desert and its location
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A high plateau encircled by mountains are called altiplanos
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