you know the first term for an alien was someone who not from where you are
the term was replaced with "forigner" (if thats how its spelt)
as for the belife of aliens in outer space, I belive that there may be some from of life on another planet wheter it be just some sort of plant but it is imposible for alien life to be anywhere on our solar system because the planets befor us (mecury and venus) are to hot to have life on them and the planets after us (mars, jupiter, saturn, uranus, neptune and pluto) are much to cold for life to exisit so there maby life on other solar systems, think about it, there is an infenet number of galaxeys in our ever growing universe, it is very unlikely that earth is the only planet that is inhabited by life, we just dont know about them because they are many light years away and intergalactic travle has only ever been a thing of fiction
but if you think about it mathamatical we shouldnt even exisit