Some people believe that governments are concealing evidence of extraterrestrial beings.
If there are extraterrestrial civilizations out there then where are they?
Scientists have found no credible evidence of extraterrestrial visitors.
They've even suggested that extraterrestrials were involved.
ET is the story of an extraterrestrial who desperately wants to "phone home".
He urged against making too many assumptions about the way extraterrestrials would want to communicate.
With regard to possible extraterrestrial life as well as artificial or robotic "life," however, a metric of similarity, while still important, may not be sufficient.
Once developed, the alien idea proved a potent motif for fictional explorations of the singularity or insignificance of humanity cultivated by the extraterrestrial hypothesis.
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