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An '''alien''' is a person who is of another family, race, nation or planet than the people among whom he or she lives. An alien can also be an inhabitant of another planet. Many aliens exist in fictional works, such as the TV series [[Doctor Who]] and [[Star Trek]], but in real life there is no real evidence that there is any life anywhere in the universe except on earth.  

An '''alien''' is a person who is of another family, race, nation or planet than the people among whom he or she lives. Since the early 20th century, fictional literature, television and films have been depicting alien beings from other planets. Many aliens exist in TV series such as [[Doctor Who]] and [[Star Trek]]. Science, however, has yet to find any real evidence that there is any life anywhere in the universe except on earth.  

In 1996 a flurry of excitement took place when some tiny fossils of microbial organisms were found on a rock that had crashed down to earth after being knocked free of the gravitational influence of [[Mars]] by a asteroid or comet, but scientists are still undecided what could have caused these and many robotic spacecraft have been sent to Mars to try to answer this fundamental question.  But apart from this, there is no evidence whatsoever of alien lifeforms.

In 1996 a flurry of excitement took place when some tiny fossils of microbial organisms were found on a rock that had crashed down to earth after being knocked free of the gravitational influence of [[Mars]] by a asteroid or comet, but scientists are still undecided what could have caused these and many robotic spacecraft have been sent to Mars to try to answer this fundamental question.  But apart from this, there is no evidence whatsoever of alien lifeforms.