Claiming there is no other life in the universe is like scooping up some water, looking at the cup and claiming there are no whales in the ocean.
Neil deGrasse TysonHow many times have you heard a person in a workplace say, "I wasn't trained for this!" That's an impossible reaction from a physicist, who would say, instead, "Cool. A problem I've never seen before. Let's see how I can figure out how to solve it!"
Neil deGrasse TysonDoes the full moon affect people's behavior, you ask? Yup. It makes people think the full moon affects people's behavior.
Neil deGrasse TysonFor all we know, the aliens have already done this and unwittingly concluded that there was no intelligent life on Earth. They would now be looking elsewhere. A more humbling possibility would be if aliens had become aware of the technologically proficient species that now inhabits Earth, yet they had drawn the same conclusion.
Neil deGrasse Tyson