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Which of the following reasons do you think best explains why humanity has not discovered or been discovered by an alien species? Published on February 24, 2017 Survey conducted on February 24, 2017 on 2008 U.S. adults
17%
24%
15%
3%
5%
12%
24%
By:
17%
24%
15%
3%
5%
12%
24%