Which of the following statements best reflects our current knowledge about the term flife in the equation Number of Civilizations = NHP × flife × fcivilization × fnow?
A)The value of flife is less than 0.0000001.
B)The value of flife is greater than 10.
C)The value of flife is between 0 and 1.
D)The value of flife is equal to 1/2.
E)The value of flife is either 0 or 1.

Question

Quizplus · Accepted Answer

Our current knowledge suggests that flife, which represents the fraction of planets with life, is most likely between 0 and 1. While we currently have not detected any alien civilizations, the discovery of microbial life on other planets suggests that flife is not zero, but we cannot assume that it is as high as 1 without further evidence.

Which of the Following Statements Best Reflects Our Current Knowledge