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Somewhere out there
Our universe is billions of years old and has been expending in every direction at the speed of light ever since. So it could be said that Earth is a negligable part of the universe. In a Universe that is infinately large how could Earth be the only planet with life.
Also, think about this: every year scientists discover more about our planet. If we don't even know everything about our home, how can we assume that we know even our own solar system.
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