Some computations of the Drake equation, given different assumptions:
R* = 10/year, fp = 0.5, ne = 2, fl = 1, fi = 0.01, fc = 0.01, and L = 50,000 years
N = 10 × 0.5 × 2 × 1 × 0.01 × 0.01 × 50,000 = 50 (so 50 civilizations exist in our galaxy at any given time, on average).
But a pessimist might equally well believe that life seldom becomes intelligent, and intelligent civilizations do not last very long:
R* = 10/year, fp = 0.5, ne = 2, fl = 1, fi = 0.001, fc = 0.01, and L = 500 years
N = 10 × 0.5 × 2 × 1 × 0.001 × 0.01 × 500 = 0.05 (we are probably alone).
Alternatively, making some more optimistic assumptions, and assuming that 10% of civilizations become willing and able to communicate, and then spread through their local star systems for 100,000 years (a very short period in geologic time):
R* = 20/year, fp = 0.1, ne = 0.5, fl = 1, fi = 0.5, fc = 0.1, and L = 100,000 years
N = 20 × 0.1 × 0.5 × 1 × 0.5 × 0.1 × 100,000 = 5,000.
http://en.wikipedia.org/wiki/Drake_equation
The Drake equation attempts to address this question... that article provides interesting estimates of the equation:
The Drake equation is a bunch of nonsense. There are just too many unknown variables.
Any formula is nonsense until realistic and accurate numbers are plugged in to it.The problem with the Drake equation is that until we find accurate numbers to plug in, we won't have any way to even speculate what the numbers should be. In other words, we need more data, but that doesn't make the formula shit. You have to know what you're trying to calculate before you can have an answer.
The Drake equation states that: N = R*x Fp x Ne x Fl x Fi x Fc x 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.
Exactly my point. We don't have anything even close to accurate numbers to plug into all those variables, therefore the equation pretty much means nothing.All the right factors are there, its just no one knows what integer to plug in to the equation, that doesn't make the equation less valid.
I don't claim to be an expert on Christian dogma or anything, but I dont see how you came to this conclusion. Where does it say in the Bible that humans are the one and only intelligent species in the universe?The problem with today is that many religions, Christianity the biggest, say that god created us and only us.