Maybe they exist but are hard to detect with current human consciousness and tech. Like an ant cannot comprehend what is a Paul Graham. I personally think the v

Maybe they exist but are hard to detect with current human consciousness and tech. Like an ant cannot comprehend what is a Paul Graham. I personally think the vastness of the expanding universe and existence of multiple dimensions makes it highly unlikely that only earth has intelligent life. Heck if there was intelligent life on Mars but undetectable to current tech or senses, we would think it empty.