If alien life is so likely to exist, why hasnt contact been made?
We have no indication that other life forms have visited our planet. We have ever reason to believe that for another life form to visit our planet, it would require technology far beyond our understanding, enormous amounts of energy, and may incur issues related to moving at relativistic speeds. Ask yourself why we havent attempted to visit other planets, even in our own solar system, despite having ample technical know how to try (and some very notable success with probes).