JoeTheJuggler
Penultimate Amazing
- Joined
- Jun 7, 2006
- Messages
- 27,766
This last doesn't follow from what you have just said. You can't possibly know this.Carbon based molecules in terrestial life have two limitations. They cannot obtain liquid water essential for their well being below freezing point. And they start to break down above a few hundred degrees C.
This narrow range of temperatures makes them suitable for life on Earth like planets only.
Remember, life began when organic molecules, molecules containing carbon, slowly began to assemble in liquid water. Carbon has an extraordinary ability to form compounds with other elements.
Water [liquid] is essential for any kind of life to begin.
Yes, and the fact that this is the only one we know about doesn't preclude something similar from happening elsewhere. (It might be due to the known limitation on what we know about the galaxy rather than a hypothetical limitation on the incidence of intelligent life in the galaxy.) In fact, we know it's possible by the example of the Earth, so we know the probability of life in the galaxy is not zero.We only have one example of this so far which is Earth, just the right distance from it's[sic] star to keep it's[sic] water liquid. not too hot that it would escape into space as vapour.
Talk all you want about carbon and liquid water, but you've done nothing to show that these things (much less other types of bio-chemistry) are impossible elsewhere in the galaxy.
It may be, but it may not be. If that's all you're arguing, I agree with you. You've done nothing to argue that the Earth is unique. Everything you've put forward as evidence that the Earth is unique has been refuted.I have already explained why the Earth may be unique in the galaxy, and why we may be on one of the first planets to produce animal life.
Yes, you've argued relying on technology millions of years ahead of us before, and that point has been utterly refuted. I'll list a number of objections again:Also, an advanced civilization millions of years ahead of us technology wise would have little trouble in scanning the heavens for life bearing planets.
1) The technology you're assuming might not be possible for anyone ever (you're positing FTL "scanning" at the very least)
2) It might be that technological civilizations don't last for millions of years
3) Even if the civilization lasts long enough, and the technology is possible, there is no guarantee that they'd be motivated to achieve it (for economic or other reasons we don't know of)
4) It's a big haystack--there could be these super-advanced civilizations all over the galaxy, and we "just" missed them by a few hundred thousand years
5) The claim "the Earth is unique" means that there are no other civilizations at least as advanced as ours; using the absence of evidence argument like this, you're moving the goalposts to say that "if there are no super-advanced civilizations, then the Earth is unique". There could be Earth-like technological civilizations even in our neighborhood even right this minute and we'd fail to detect them (and they us). It's moving the goalposts to assume that they must be super-advanced.
Again, please don't assert this "they must be able to detect us" (a minor modification of the argument based on Fermi's Paradox) without addressing each of these points.