I'm with you I need to see them or at least some reliable source like family or friend who see it I will belive.
What about hoaxes, smoke & mirrors, projections, holograms, subliminal advertising, subsonic waves, hallucinogens, lucid dreaming and brain damage.
If you see aliens while whacked out on PCP then is seeing still believing?
There are no space aliens, there is no space or alien solar systems. You may however find dragons, witches and wizards if you start getting too close to the edge.