Alien

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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. Since the early 20th century, fictional literature, television and films have been depicting alien beings from other planets. Many aliens exist in fantasy 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.

The Search for Extraterrestrial Intelligence (SETI) is a program to scan the sky in radio bands likely to be used by other civilizations. Thousands of candidate nearby stars have been examined, but no signal has been found. In 1967 there was some excitement when a regular series of radio pulses were picked up, but this was determined to have natural causes and was the first detected pulsar.

Despite the lack of evidence for the existence of extra-terrestrial aliens, authorities receive hundreds of reports each year from people claiming to have had some form of contact with Unidentified Flying Objects, or UFOs, with some even reporting to have had an encounter with alien beings.