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When we talk advance life we can look to earth as an example. Is there life on a planet with methane seas? Maybe, but I would not think advance life much less some kind of civilization would be sailing the seas there. So far we have seen that advance life falls within a extremely narrow band even though life in general has been seen out farther from that band in both directions. We can look at the extreme life on our planet and see it doesn't get very far even though the rest of the planet is unrestricted.
These completely different life types right now are basically fictional, so the "what ifs" are great, but I'm really expecting that complex life follows somewhat of the same requirements we see on earth.
The whole habitual zone really comes down to whether water can be in a liquid form or not. Any life that doesn't need water would be extremely alien in nature, not saying it is not out there though.
originally posted by: Soylent Green Is People
a reply to: JadeStar
While I personally agree with you, and I feel there almost certainly is a lot of life in the galaxy, and probably a lot of complex life, a part of me still wonders if we know enough to fill in a value for fl.
I still think that the value we assign to fl can't be anything more than a wild guess until we learn more about how life began here on Earth. We still don't know enough about what sparked life, or what exactly was the tipping point between "non life" and "life...
...i.e., what was the first thing that was considered "alive", and what was the thing that immediately came before it that was not "alive". What event or series of events occurred that tipped the scales for that non-living group of molecules to develop into something that we would recognize as life.
Like I said, I personally think that life probably is relatively ubiquitous in the galaxy, and I think even complex life may be relatively common, so hopefully nobody will reply with attempts to convince me of such by talking about the shear size of the universe; I don't need convincing. However, what I think is irrelevant, and I could be wrong.
It seems that before we can set a real value for fl that I am comfortable with (other than my simple "belief", which is not at all meaningful when we get right down to it) we need to understand how OUR life began -- and we don't.
Your theory about inventing radio+10years was really good I liked it.
If development is exponential in time, resources remain finite.
maybe they evolved into spiritual beings of light.
Then again it is difficult to see us evolving any further, we are simply growing weaker.
originally posted by: MysterX
a reply to: kykweer
Who knows, maybe some have done. Or at least, evolved technology to allow them to leave their bodies behind and become like light-beings through advanced tech.
Imagine computing power combined with nanotechnology in a 1000 years time. We could well become 'light' or spirit beings ourselves.
The technological power available to us will literally make us immortal and godlike. The nanites that could make up our bodies will be each powered by a series of future nano-quantum computers able to carry our consciousness and personality / memory and reorganise and change our physical shape into any form we wanted to take on demand instantly, anything from ethereal 'spirit beings' to a gust of air, to any shape or form we wanted to take.
Imagine 10,000 years down the line...or a 100,000 years?
Probably wouldn't even need physical craft to travel anywhere in the Galaxy...just reorganise ourselves into a 'light-ship' and go.
I have a problem with this though, scientists want to us to believe that we evolved over 4,5 billions years... or even 14 billion years naturally... but now today humans are "special" our future evolution will happen technologically?
Our entire human history since living as nomads we have constantly explored and searched for resources, conflict has followed us everywhere, I want to share your optimism that "next time it will be different", but I can't.
Hence, more time for some life to become advanced.
originally posted by: StellarX
The relative silence in our local area then basically proves that FTL travel is either impossible or impractical ( too dangerous or too expensive) or that sentience is a very dangerous thing indeed and intelligent life/species have a very limited shelf life!
originally posted by: Ross 54
It may merely be that extraterrestrial civilizations wish to avoid establishing an overwhelming presence in relatively primitive cultures, such as ours. We, ourselves, are already wise enough to have cultural and ecological preserves on this planet, where things are allowed to proceed with very limited interference. Earth itself could be such a preserve, as far as extraterrestrials are concerned.
originally posted by: Xtrozero
Earth maybe got it right once in 4.5 billion years, maybe, so I have a hard time believing there is a Star Trek utopia out there.