Still the Fermi Paradox (But Really, Where Is Everyone?)
摘要
After exploring fifty shades of Drake’s equation, spanning astronomy, geology, biology, paleontology, and futurology, we surprisingly found that the number of current planets inhabited by static type K1 (or lower) galactic civilizations, with an average duration of 50,000 years, is around 3—that is, us and perhaps someone else about 17,000 light-years away, which is very far.