Aliens are usually defined as “a creature from outer space or extraterrestrial”. But what comes first in our mind after hearing the word ‘Alien’? Alien is the created character of science-fiction based Hollywood movie or such ideas like that. But there is a question whether aliens really exist? If yes, how they look like? Are they available on our planet or not? Have they visited on the earth? – These are some common questions that come in our mind.
