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Originally Posted by JMF 20  Im sorry but is there any chance that there are other worlds that sustain life just like ours? (Yeah, maybe not humans but as in life that is as/more intellegent as our own). It has bothered me for some time and i would like to know some opinions on this theory. |
That is what you will get : opinions, and nothing else.
I do not see anywhere any "theory" here. Just a suggestion (or even more a query) about other worlds that sustain life (like ours). I assume you mean intelligent life with that.
With hundreds of Billions of galaxies, with each hundreds of Billions of solar systems, there is good reason to assume that in any of these many thousands x Billion x Billion solar systems there are at least several where planets orbit within the goldilocks zone.
Goldilocks zone : the zone within orbit limits where water is possible to form as a liquid. Water is an essential requirement to allow life (as we know it) to form.
Seen the quantities of solar systems involved, millions of such planets should be around.
With so many potential life-baring planets it would be strange if life would only have developed on planet earth. So we may safely assume that there are millions of planets that carry life.
The much more difficult question is the one about intelligent life.
Earth is around 4,3 Billion years old, and although it took approx. 0,5 Billion years for single celled life to start here, it took another approx. 3 Billion years for single celled life to develop into multi celled life, that allowed through evolution the explosion into all kinds of different lifeforms, which in the end led to life as it is today.
A very important influence for earth in this process was the result of an early collision with another planet or planetisimal that resulted in our out-of-any-proportion big moon, that helped to stabilize the earth rotation angle against the earth orbit path, resulting in stable summers and winters.
Another later influence on earth's climate (essential for the development of "higher" life forms) was the build-up of CO2 reserves in the earth crust instead of the CO2 remaining in the atmosphere, where it would have caused Venus-like conditions due to green house effect and the over-time increasing radiation effects of the sun.
Nobody can guarantee you that there are worlds similar to planet earth, with so much abundant life. Local conditions have too much influence on that, and these planets are most probably far to far away for us to ever find out.
So if you want to hear my "guesstimate" : sure, seen the numbers involved it is highly likely that there are many, many planets that have by now developed intelligent life.
Epiloque :
However : "intelligent life" does not mean
INTELLIGENT life. Humanity is destroying it's own habitat in it's insane quest for more and more, fed by personal greed, and at the expense of everyone and anything else. Not very good for the most intelligent species on planet earth !
As to alien intelligent life : I hope that - if they exist - we will never hear from them, because - if they in anyway resemble us (and why should they not?) they could very well be an enormous threat to our own existence.
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