Originally posted by another user
a·li·en (l-n, lyn)
adj.
1. Owing political allegiance to another country or government; foreign: alien residents.
2. Belonging to, characteristic of, or constituting another and very different place, society, or person; strange. See Synonyms at foreign.
3. Dissimilar, inconsistent, or opposed, as in nature: emotions alien to her temperament.
n.
1. An unnaturalized foreign resident of a country. Also called noncitizen.
2. A person from another and very different family, people, or place.
3. A person who is not included in a group; an outsider.
4. A creature from outer space: a story about an invasion of aliens.
5. Ecology An organism, especially a plant or animal, that occurs in or is naturalized in a region to which it is not nativeAliens
So when you refer to something living on a different planet you can call it an alien. As there are so many stars out there, millions, atleast one must have a planet with all the right features to support life. Also if you think that it's impossible then you've got to think, we're living on earth, it is possible for life to exist. So howcome not anywhere else?