How to spot an alienspacecraft

Hi E.A., In what ways can you spontaneously see an alien spacecraft? When you are outside without consciously channeling. Is the spacecraft materialized in this dimension? Or can we perceive it when we look through their dimension? Or is it a match on both dimensions? Is there always the (un) concious will to communicate with each other? Can aliens be as surprised as we are when they see us? Thank you!