..circumstantial evidence seems overwhelming...possibility of life elsewhere is a major probability; maybe definitely, with the Martian rock found at one of earth's (north I think) poles seeming to have fossilized microbes embedded in it......as for intelligent life elsewhere:
The Drake equation (also sometimes called the "Green Bank equation," the "Green Bank Formula," or erroneously labeled the "Sagan equation") is a famous result in the fields of exobiology and the search for extraterrestrial intelligence (SETI).
This equation was devised by Dr. Frank Drake (now Professor Emeritus of Astronomy and Astrophysics at the University of California, Santa Cruz) in 1960, in an attempt to estimate the number of extraterrestrial civilizations in our galaxy with which we might come in contact. The main purpose of the equation is to allow scientists to quantify the uncertainty of the factors that determine the number of such extraterrestrial civilizations.:
The Drake equation states that:
N = R^{\ast} \times f_p \times n_e \times f_{\ell} \times f_i \times f_c \times L \!
where:
N is the number of civilizations in our galaxy with which communication might be possible;
and
R* is the average rate of star formation per year in our galaxy
fp is the fraction of those stars that have planets
ne is the average number of planets that can potentially support life per star that has planets
fℓ is the fraction of the above that actually go on to develop life at some point
fi is the fraction of the above that actually go on to develop intelligent life
fc is the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L is the length of time such civilizations release detectable signals into space.
The problem, of course, is that none of the terms can be known, and most cannot even be estimated. The only way to work the equation is to fill in with guesses. [...] As a result, the Drake equation can have any value from "billions and billions" to zero. An expression that can mean anything means nothing. Speaking precisely, the Drake equation is literally meaningless...
http://en.wikipedia.org/wiki/Drake_equationHaving seen a
lightless array of three disk shaped forms flying moderately slow (as compared with a small piper) and in a triangular formation without a sound at what seemed to be a relatively low altitude (Reese Air Force base is just outside of Lubbock...) - without audible or visual escort; shortly after dusk in Lubbock, Tx. air space; not far over Nashville Ave. and 20th street in 1973 (this capability with aerodynamic technology is obviously
not in sync w/ the times) I dare say that in my mind some of the values in the Drake Equation are not zero...or I was experiencing a flash back.........................................................
Not 