According to drakes equation
N = R* • fp • ne • fl • fi • fc • L
N = The number of civilizations in The Milky Way Galaxy whose electromagnetic emissions are detectable.
R* =The rate of formation of stars suitable for the development of intelligent life.
fp = The fraction of those stars with planetary systems. more info
ne = The number of planets, per solar system, with an environment suitable for life. more info
fl = The fraction of suitable planets on which life actually appears.
fi = The fraction of life bearing planets on which intelligent life emerges. For more information, please visit Dr. William Calvin\'s "The Drake Equation\'s fi"
fc = The fraction of civilizations that develop a technology that releases detectable signs of their existence into space.
L = The length of time such civilizations release detectable signals into space
of all these factors i think L is the most important because if L was say 100 million(i\'m being optimistic here:p) years that would raise the number of civilizations to 4million(this is an estimate) and this is only in the milkyway let alone the universe.
with such numbers i dont think anyone can refute the
possibility that aliens exsist(excluding clowd offcourse).
