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I think you meant to say grains of 'sand', not 'salt'. More stars in the universe than grains of sand on Earth. The more than one universe statement has not been proven - only a theory.You can add up all the grains of salt that have ever been created and it still wouldnt be as much as stars. Also learned There are more than 1 universe. There can be dozens or even hundreds of Universe.
No, actually the universe is now shrinking. If it expanded from 'the big bang', it is finite.Universe is infinite so ya there’s lots.
No there aren't. Even if you added all the 'atoms' in a gallon of water, it would be way less than the number of stars in the universe.By the way, there are more molecules in a Gallon jug of water than stars in the universe.
One 'atom' of Uranium-235 = 143 Neutrons and 92 Protons. The added Neutron starts the nuclear chain reaction. A whole other universe that we can't see - the subatomic universe.