TIL in 1961, astronomer Frank Drake created the Drake Equation, a formula to estimate the number of communicative alien civilizations in our galaxy, sparking the modern search for extraterrestrial life.
https://www.seti.org/drake-equation-index
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https://www.reddit.com/r/todayilearned/comments/1jra4xm/til_in_1961_astronomer_frank_drake_created_the/
Drake Equation
"What do we need to know about to discover life in…
SETI Institute