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    (Original post by zhog)
    If we look at how life seems to have originated on this planet, that dates back about 3.5 billion years. That's life as in its most basic single-celled form but with an ability to replicate due to its DNA from which we all have evolved. One day there was a bag of chemicals that twitched and somehow copied itself into a twin and the rest is history, as they say.

    What that tells us is that life can 'appear' in an environment like that of the Earth that long ago, the crust hadn't even fully formed at that stage. We do know how bacteria can live in the most varied environments, feeding on acid if that is all on the menu, and how it has be found deeply buried underground. That versatility and resilience suggests it is most likely to have come about elsewhere out there.

    Microbial life out there is quite likely but how much of it manages to evolve may depend on a specific scenario. Alternatively, it may evolve into something of its own as shaped by the environment and look quite ugly and repellent to us.
    Also if you think about it, life has been around on earth for millions if not billions of years, and we have only got to the "intelligent life" stage within the last few thousand years. There is no reason to expect that extra-terrestrial life would be at the same stage of evolution as us
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    (Original post by Alex from almanis)
    Also if you think about it, life has been around on earth for millions if not billions of years, and we have only got to the "intelligent life" stage within the last few thousand years. There is no reason to expect that extra-terrestrial life would be at the same stage of evolution as us
    That's true. We're on a young planet, orbiting a young star. If an intelligent race were born in this galaxy, chances are it would be far older than us and far more advanced.

    Fermi was a mathematician who figured out that if aliens existed in this galaxy, and they sent out a colonization vessel that traveled only slightly faster than we are currently capable, and that planet sent out another one 1000 years later, and they kept doing so every thousand years, the entire galaxy would have been colonized a very very long time ago.

    https://en.wikipedia.org/wiki/Fermi_paradox

    Whatever the answer is to that is the answer to, "Is there intelligent life out there?" - Either life is far less than 1 intelligent species per galaxy or something is stopping us from being contacted - Either everyone gets destroyed before they become a civilization capable of contacting others or they are deliberately not contacting us.
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    (Original post by Alex from almanis)
    Also if you think about it, life has been around on earth for millions if not billions of years, and we have only got to the "intelligent life" stage within the last few thousand years. There is no reason to expect that extra-terrestrial life would be at the same stage of evolution as us
    Of course not, although the timing of its appearance on Earth (estimated 3.5 billion years for single-celled lifeforms) suggests it may be likely to occur at the point a planet is forming. It could be the case that an amino-acid rich meteorite crashing into a sympathetic environment tonight would trigger an evolutionary process but that would mean a huge gap between them and us.

    it must be expecting too much for us to ever bump into an alien humanoid. If we regard life as something that starts at unicellular level and goes on to evolve into whatever the environment shapes it into, there is no chance of that happening. On top of it, we have the specific impact of events like those that caused widespread extinctions on Earth. We wouldn't be here just yet weren't it for them.
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    (Original post by zhog)
    Of course not, although the timing of its appearance on Earth (estimated 3.5 billion years for single-celled lifeforms) suggests it may be likely to occur at the point a planet is forming. It could be the case that an amino-acid rich meteorite crashing into a sympathetic environment tonight would trigger an evolutionary process but that would mean a huge gap between them and us.

    it must be expecting too much for us to ever bump into an alien humanoid. If we regard life as something that starts at unicellular level and goes on to evolve into whatever the environment shapes it into, there is no chance of that happening. On top of it, we have the specific impact of events like those that caused widespread extinctions on Earth. We wouldn't be here just yet weren't it for them.
    That's very true, although if aliens were capable of interstellar travel and/or radio telecommunications it's likely that they'd have at least a similar type of intelligence to us, and that we would be able to communicate if we could somehow translate into their language (assuming they have one).
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    (Original post by Alex from almanis)
    That's very true, although if aliens were capable of interstellar travel and/or radio telecommunications it's likely that they'd have at least a similar type of intelligence to us, and that we would be able to communicate if we could somehow translate into their language (assuming they have one).
    That's true as well, perhaps life is physically compelled to evolve into humanoid or whereabouts form wherever it manages to get a foothold. If UFOs mean alien life has been over there has a to be a fair share of common ground between us.

    That would probably suggest life is not a random cosmic accident, the way I see it.
 
 
 
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