Briefly summarize current knowledge about the term flife in the ...

[xclash]

Briefly summarize current knowledge about the term flife in the equation
  Number of Civilizations = NHP  flife  fcivilization  fnow.
 
  What will be an ideal response?

Question 2

Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
 
  A) Jupiter's gravitational tugs keep them there.
  B) They are held in place by resonances with other asteroids.
  C) Actually, we never see asteroids in the gaps.
  D) They are kept in place by shepherding asteroids.
  E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.

[samiel-sayed]

Answer to Question 1

flife is the fraction of habitable planets with life. We know that at least one planet within its star's habitability zone has developed life, namely the Earth, but beyond that, we have no real evidence on which to base an estimate of the value of flife.

Answer to Question 2

E

[xclash]

Thanks for the timely response, appreciate it

[juliaf]

Great answer, keep it coming