Banned because humans were always creating many different mythical creatures, Gods, evil creatures (demons and such), holy angelic creatures, and in modern days aliens. This is just the wild human imagination in all its glory, because now we are more advanced technoligocally than ever, and its only natural that we are creating fictionary creatures such as aliens, who as many people say, are a lot more advanced than us, and will want to conquer earth for its resources.
Andromeda, the nearest spiral galaxy to our own, is 2.500.000 light years away, and that means that if an alien form of any kind, attempted to travel to earth, and was able to travel with the speed of light, it would take them 2.500.000 years approximately. There are unproven theories for faster-than-light travel, that are only based on other unproven theories, such us wormholes, or other ways of distorting space-time continuum.
Yeah....its all bull$hit 
