franco b wrote:While it is true that if it is possible for a thing to happen, it will happen given enough time. We are proof that intelligent life is possible, but I think you need a lot of zeros after the number to calculate the odds against intelligent life forming twice.
There is a lot of zeroes, that's really the point. How many grains of sands on every beach on earth? That's the example that is often used to give perspective on the estimated number of suns we know of. They can have X amount of planets that can have X amount of moons either of which can support life. The numbers are staggering.
There is lot of things that make our planet special, firstly we're in a solar system that is the odd ball. Most of them that they are finding do not have planets with stable orbits so you're going to have wildly fluctuating temperatures etc. We're in the godilocks zone, it's not too hot or too cold and water is liquid on most of the planet. We have a Jupiter, Jupiter protects the earth from asteroids. We have a very large moon which is not common, that stabilizes the rotation of the planet giving us seasons.
There is lot of things that need to happen if you expect to find another earth type planet or moon but again due to the amount of stars....