original: earth is the only place in the universe where life has been confirmed to exist .
simplifications: the earth is the only place in the universe where life has been confirmed to exist . earth is the only place in the universe where life has been confirmed to exist . earth is the only place in the universe with confirmed life . earth is the only place in the universe where life has been confirmed to exist . earth is the only place in the universe where life exists . earth is the only place in the universe where life has been found . in the universe , life has been confirmed to exist only on the earth . earth is the only place in the universe where life has been proven .