Is it possible there could be life on this planet that doesn't originate from here? Yes by that I mean ALIEN LIFE! This really does depend on what one means by life. Does microscopic life count as life? If you answer yes to this question then microscopic life from elsewhere has already been found. Rocks have been found that travel from planet to planet. Bacteria has been found on rocks that originated on Mars. These rocks get ejected when Mars gets hit by a large asteroid from the asteroid belt, with such force the ejected rock has ESCAPE VELOCITY to leave Mars's thin atmosphere. The escaping rock or rocks then travels through the solar system until getting caught by a planet's gravity. In some cases Earth. I, like many other people, don't really consider microscopic life to be life. So what is life? I would argue most people mean intelligent life. No rock solid (no pun intended) evidence of intelligent life has ever been found. Some people though, are so hellbent ...