Are aliens hard to find because they're extinct? - Christian Science Monitorhttp://www.csmonitor.com/Science/2016/0124/Are-aliens-hard-to-find-because-they-re-extinct
Researchers Aditya Chopra and Charles Lineweaver, both of the Australian National University, recently published a paper in the journal Astrobiology suggesting that extinction could be the main cause of humanity's fruitless search for extraterrestrials.
Submitted in section: Paranormal news 2015: Are aliens hard to find because they're extinct? - Christian Science Monitor