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Why is the universe expanding ?

Are there possibilities that Big Rip will happen ?
Why & How do we conclude that this is possible ?!


After the Big bang An expansion occurred it is occurring now also !
therefore,now also universe is expanding.
Yes there are possibilities of the big rip because a time will come when the stars , voids move apart from galaxies !  when the nuclear fusion will stop the universe will freeze !
This is the conclusion &  reason .   
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