last time i checked our galaxy had 100 to 150 billion stars.

i dunno what other galaxies contain but obviously your 10 billion and some other post mentioning trillions is completely made up!

There is also the incredibly high possibility that intelligent life once existed on other planets in our galaxy that came together to form a magnificent Empire which killed each other off several billion years before you were winked into existence behind the waste bins of the local niteclub.

Roll the dice.

Image from the Hubble

that was aiming in 1 spot in the sky (a tiny spot between some stars that appeared to be blank). They saw 10,000 galaxies... each shiny spot is a galaxy, each galaxy contains about 10 billion stars, each star has the potential to have a solar system.

I'd say probability is working against the op on this one

There is no proof of anything I believe, as that proof is currently unobtainable.

This. Also, OP argument is flawed from the outset with determining what is meant exactly by 'common' ?

FTL Travel. If practical FTL travel existed, it would only take one civilization to spam itself across the stars. (Imagine if Humanity had "warp engines" for a million years.) Since we don't see other civilizations, practical FTL travel isn't possible, thus Humanity is limited to our solar system and will eventually go extinct here.


/deep_thoughts

He then made 2001 the space odyssey.

Just remember that you're standing on a planet that's evolving
And revolving at nine hundred miles an hour,
That's orbiting at nineteen miles a second, so it's reckoned,
A sun that is the source of all our power.
The sun and you and me and all the stars that we can see
Are moving at a million miles a day
In an outer spiral arm, at forty thousand miles an hour,
Of the galaxy we call the 'Milky Way'.
Our galaxy itself contains a hundred billion stars.
It's a hundred thousand light years side to side.
It bulges in the middle, sixteen thousand light years thick,
But out by us, it's just three thousand light years wide.
We're thirty thousand light years from galactic central point.
We go 'round every two hundred million years,
And our galaxy is only one of millions of billions
In this amazing and expanding universe.

The universe itself keeps on expanding and expanding
In all of the directions it can whizz
As fast as it can go, at the speed of light, you know,
Twelve million miles a minute, and that's the fastest speed there is.
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger all down here on Earth.

http://vimeo.com/1350717

I find the whole model laughable because OP only establishes what we already know what conditions were required to give carbon based life, as we currently know it, a chance on this planet.

I find the whole model laughable because OP only establishes what we already know what conditions were required to give carbon based life, as we currently know it, a chance on this planet.

I find the whole model laughable because OP only establishes what we already know what conditions were required to give carbon based life, as we currently know it, a chance on this planet.

Looking to establish some kind of universal model for alien worlds with different conditions for extraterrestrial life is frankly deluded.

While we are on the subject; define intelligent life for me? Because I see signs of intelligence in nature, like chimps using tools or dolphins using ingenious ways of catching fish and plenty of people displaying nothing that could be ever defined as intelligent.

i actually read something that a guy calculated that there will be about 50 solar systems (out of 1 billion) in the milky way that can host intelligent (not considering that the people have colonized other systems) and many of them might have lower tech.

it's all in the eye of the beholder. what one must know is, if you find intelligent life, prepare to be surprised, because it might not even have eyes, legs, arms or even mouths. it might even be a blob that breathes sulphur and communicates thru telepathy or any other type of communication method we don't know, nor even dream about.