text: Aliens are not going to arrive, so there is no worry about them proving anything.  The "Anthropic Principle" proves that the universe is fine-turned for intelligent life to be on earth and no where else in the universe. We know for sure there is no intelligent life as far out as 230 light-years. From 230 light-years away, it would take a spacecraft traveling at 7 million miles per hour, 23,000 years to get here, if it were able to miss all the space junk and the fuel and craft and beings didn't expire.