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...wrote down an equation for the chance of a contactable [[Extraterrestrial life|alien]] [[civilization]] from another planet in the [[Milky Way Galaxy]]. T ...''e''</sub> = the average number of planets that can potentially support [[life]] per star that has planets ...

...ought to exist within Callisto. This may mean that [[extraterrestrial life|life]] might exist. However, this is less likely than on nearby [[Europa (moon)| ...