<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>
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Uranium because it is a <span>fuel that is assembled in such a way that a controlled fission chain reaction can be used. The heat created by splitting the U-235 atoms is then </span>used<span> to make steam which spins a turbine to drive a generator, producing electricity.</span>
