Stephen Hawking warned us about contacting aliens, but this astronomer says it's 'too late'

In 2010, physicist Stephen Hawking voiced concern about the possibility that we might contact extraterrestrial life by transmitting signals into space. 

However, SETI senior astronomer Seth Shostak told us that it’s too late to consider whether we should send such transmissions, because we’ve already been doing it for decades.

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