May be yes and may be not but one thing is sure that it gives us enough excitement and interest when we do talk about their existence and prove of their presence!!!
Yes, I belive aliens exists. As we are on the other. there will be some living being on other planet, for us they are aliens . If we land on their planet then we are aliens to them :)
aliens means the living beings in other planets. some times they travel from planet to planet. so we found them on our earth and our scientists kept a name alien to them
