Theoretically, there should be life out there. Almost 99.99% chance of it. Mars is a likely candidate for a former host of life die to ancient stomadolites, ancient bacteria that form pyramid clusters usually found in very shallow water. Intelligent life is more complex, which gives us a paradox. If it exists, then why hasn't it visited us publicly? Is it in contract with governments or does it not want to visit Earth? If so, what about the sightings we have reported daily? This is what the Drake Equation tries to solve, and the answer isn't too bright. Either way, "Two possibilities exist. Either we are alone in the universe or we are not. Both are equally terrifying" - Sir Arthur C. Clarke