Go to Youtube and look up the Disclosure Project. It is a group of former government officials who are trying to get congress to disclose information about aliens and UFO's that has been known for decades. Three hundred eye witnesses, I believe. It scared the bejeezers out of me. You cannot really go into it aside from religion, but since you didn't ask about that, this information should do. I believe that aliens do exist, but not as we know them. You can also look up "aliens in historical art" on google, and you will seriously be astounded. Cue the X-file music, and enjoy.