Drake equation dating
The movie "Contact" has a good depiction of the detection of an ET signal and subsequent events.What are the possibilities that we will find ET signals?Another key weakness is Fi -the fraction of those Earthlike planets (10,000 was Drakes estimate in the Milky Way) on which intelligence evolves.To date, there isero evidence that there is a "life principle" directing primal chemical soups towards the glory of a -like species. He did not have a copy of the equation so he made up his own, which is the "second variation" from "Future's End". It was used by Gene Roddenberry in 1964 in his pitch for Star Trek.
See the Links section for more details on the Drake Equation.
At least, that is what some scientists and others connected to the field of extra-terrestrial search believe, such as George Dvorsky, who serves on the Board of Directors for the Institute for Ethics and Emerging Technologies.