SETI (Search for Extraterrestrial Intelligence), now a privately funded company, is pointing its antennas to the sky for half a century, but so far the only excited moment (on Aug. 15, 1977) Jerry Ehman, SETI scientist working with Ohio State University’s radio telescope, registered a signal 30 times as strong as the background noise of deep space during an interval of 72 seconds and with a frequency compatible with spectral line of hydrogen. And, then he wrote the word “Wow!” on the printout of the radio telescope signal… Never again a similar result was produced.
Frank Drake, astronomer and SETI founder wrote a mathematical equation giving the likelihood to find “intelligent life” in the universe. According to Drake, the number of civilizations in the Milky Way capable of producing detectable radio signals is given by the cold mathematical formula:
N = R* • fp • ne • fl • fi • fc • L
(see the meaning of factors in Ref.) Filling the equation with highly conjectured information, Drake obtained 10,000 and Carl Sagan, 1 million intelligent civilization, only in the Milky Way… The beauty of mathematics!…
Paul Davies, the author of the acclaimed book Eerie Silence, professor and cosmologist at Arizona State University, can’t find any rational on an intelligent-life argument. In particular, Paul Davies finds an exaggeration on the factor involving the subset of planets that could support life. There is only one planet, ours!, where we know life has existed; all the rest is guesswork. That’s enough to replace the factor with a zero, and the entire equation reduces to zero too as well… After all, we are sending radio and TV messages that straight 100 light-years in a sphere, while the universe spans along 13.8 billion light-years. We are a local broadcast civilization!… Besides all these mathematical considerations, what we got until now is an “eerie silence”…
Another source good for meditation is Hugh Ross, Christian astronomer. In his book Creator and the Cosmos , Ross makes a detailed study of the universe and 66 characteristics of our galaxy, solar system, and the planet that are finely-tuned for life to exist. Among factors that contribute to the existence of biological beings are the size, temperature, and brightness of our sun, the size, chemical composition, and stable orbit of Earth, the presence of one moon instead of two or three, the distance of the Earth from the sun, the tilt of the earth’s axis, the speed of the earth’s rotation, the time it takes Earth to orbit the sun. It would be enough that one of these referred factors diverge from the actual values by a few percent, and planet Earth would be unable to sustain life. Moreover, and interestingly, it was recently discovered that Jupiter and Saturn help to stabilize the orbit of Earth. Their absence at exactly their location, would impart to Earth a different orbital energy and, instead of its present near circular orbit, our planet would acquire an elliptical orbit that would heat the planet too much between seasons and augment the probability of meteoric bombardment. Considering all these decisive factors, Hugh Ross estimated the probabilities of life and he got the number 1 x 10-166 !
An estimation of 1022 (10 billion trillion) planets in the universe, which is one for every star, and combining the probabilities, the number obtained is 10-144 planets in the entire universe that could support life! By all the odds, we, humans, we shouldn’t even be here!… But unless the universe is different on the other corners of the universe, and the universe is not spherical as cosmologist used to assume, and there exist privileged points of observation (the Cosmological Principle), the Bible was right, we are alone, the Creator (God, Shiva, Allah, Kami, The Architect, Nature, Intelligent Design, if any…) created life only on this planet, and this frightening thought should be enough for our “scientists”, politicians and global leaders, to cherish, respect, and protect life on our gifted, magic, unique, planet.
 Paul Davies, Eerie Silence, link here: http://bookzz.org/book/1207242/4cc0e8
 Hugh Ross, The Creator and the Cosmos: How the Greatest Scientific Discoveries of the Century Reveal God, see also here: http://www.reasons.org/articles/strengthening-the-case-for-a-cosmic-creator-part-1-of-2