What started as an internet joke has generated a stern military warning after more than a million people "signed up" to "raid" Area 51—a secretive military installation in Southern Nevada long fancied by conspiracy theorists to be hiding evidence of a crashed UFO with aliens. The purpose of the planned raid is in order to "see them aliens." In the following Q&A, astronomy professor Jason Wright discusses the public's interest in answering the age-old question: Are we alone?

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