How many intelligent civilizations should there be in our galaxy right now? In 1961, the US astrophysicist Frank Drake, who passed away on Sept. 2 at the age of 92, came up with an equation to estimate this.
. The Drake equation, dating from a stage in his career when he was"too naive to be nervous" , has become famous and bears his name.
Whatever reasonable values you feed into the equation , it is hard to avoid the conclusion that we shouldn't be alone in the galaxy. Drake remained a proponent and a supporter of theThe expanded Drake equation.
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