Are we alone?

Britva

Eats steel for lunch
I take great interest in the topic of space and Universe, always have.

It is interesting that our system won’t be wiped out by the explosion (supernova) of the Sun, but rather by another star, Betelgeuse in the Orion constelation. However that wont happen for another million years or so. This star is very large, old and already on the decline.



.... that is, unless we’re hit by something else in the meantime.


Life in the visible Universe has not been found, but we can say with high probability that there is life out there. Why is that?

“There are about 10 billion galaxies in the observable universe! The number of stars in a galaxy varies, but assuming an average of 100 billion stars per galaxy means that there are about 1,000,000,000,000,000,000,000 (that's 1 billion trillion) stars in the observable universe!”

Now, for every star we can see, we can also see the planets around them, that’s what the scientists say. All it takes for life to form on a planet, is for it to be positioned in that “golden belt”, not too close to the star so it’s too hot (Venus), and not too far from it, so it’s too cold (Mars). Can we really, honestly believe that in 1 billion trillion stars (times who knows how many planets around them on average), there is not another one - or even 100 - positioned so nicely, as our Earth? I think there is a high probability one or two are!

Still, we haven’t been able to find any yet, and let’s face it, they would be all too far from our human reach. But what about robots? Scientists currently believe that our best chance of “moving” to another system, is to send robots who are able to... multiply, or rather create copies of themselves. :) Further dwelling into that particular subject leads to the discussion about technology and artificial intelligence, and that opens all kinds of doors, both good and... less good, let’s say. We are still very far from this ourselves, but what the science believes is that today, if we did encounter a member of an alien race, it would likely be a robot! Kinda brings Transformers to mind... Personally, I feel there could be much more advanced forms of life in the Universe than our own, those evolved beyond our current understanding of time and space. But I digress.... and risk being proclaimed a lunatic.

What we do know is that there is a liquid ocean below the frozen surface of one of Saturn’s moons, Enceladus, in our own Solar system. Scientists are exploring options of sending submarines up there, to check for potential forms of microbial, primitive forms of life. This is something we can probably expect in the next few decades. We also know (for a few years now) that water interminently flows on Mars.
 

MntnMan62

Forum GOD!
I actually think that at some point in time there has to have been, is or will be other intelligent life out there. But that's just it. It is possible there was life on another planet trillions of miles away and the've died out long before we came along in our little part of the universe. Or, they could still exist yet so far away neither one of us has the capability to get anywhere near one another. Or, it is possible that they don't exist yet and could rise up long after we've done ourselves in. Time is as immense as the infinite size of the universe. It's infinite. Time won't end unless the entire universe ends. I don't see that happening. The only way we can ensure our continued existence for a period of time that is relevant in terms of the universe, we will need to find another habitable planet and colonize it. And then find another, and colonize it. And so on. Then maybe we have the making of a real life Star Wars movie.
 

Britva

Eats steel for lunch
Sure, but his statements are a hundred years old and cannot be taken without looking at where the science, in this case probability theory is today. We know that entropy is a property of every system, and if something is uncertain, it doesn’t mean it’s non existent.

Say you’re looking at a box of soap on a website. It’s normally closed, so you don’t actually see the soap. The vendor claims there’s soap inside and wants to sell it to you for money. You buy it, but you don’t know for certain until you have it in hand and open the lid.

Or you buy a “shave-ready straight razor”. The seller claims it’s shave-ready, but you don’t know until you buy and try it.

It’s easier to see the uncertainty in the second example, but in fact it can be calculated for both.
 

Boru62

Shaving Boar
Sure, but his statements are a hundred years old and cannot be taken without looking at where the science, in this case probability theory is today. We know that entropy is a property of every system, and if something is uncertain, it doesn’t mean it’s non existent.

Say you’re looking at a box of soap on a website. It’s normally closed, so you don’t actually see the soap. The vendor claims there’s soap inside and wants to sell it to you for money. You buy it, but you don’t know for certain until you have it in hand and open the lid.

Or you buy a “shave-ready straight razor”. The seller claims it’s shave-ready, but you don’t know until you buy and try it.

It’s easier to see the uncertainty in the second example, but in fact it can be calculated for both.
Schrödinger's cat:
Quicker version:
 

sɐǝɹpu∀

riverrun
Isn't this where the Fermi Paradox comes in?
Not so hurried my friend! First, we need to do the Drake equation!
Then, when we have figured out that the galaxy must be teeming with intelligent life, we ask ourselves where the hell everyone is - and that's the Fermi paradox.
Then again, we might look at the Drake equation and figure out that we are alone in the Galaxy and the Fermi paradox vanishes in a puff of vast, empty, cold, dark space.
By the way: in this context, Schrödinger's cat is neither here nor there.
 

sɐǝɹpu∀

riverrun
Herein lies Schrödinger's cat, as life is intrinsically tied to other parameters. Planets which lie in the golden zone must be thought to have and not have life until the box is opened.
Nah. It just means that we don't know.
In your interpretation life is like a box of Schrödinger's chocolates.

P.S. I'm proud of you guys. There was a similar discussion across the pond on TSD a while ago (has it been deleted?) and within a few posts, there started a furious exchange of Bibel quotes trying to settle the case.
 

Boru62

Shaving Boar
Nah. It just means that we don't know.
In your interpretation life is like a box of Schrödinger's chocolates.

P.S. I'm proud of you guys. There was a similar discussion across the pond on TSD a while ago (has it been deleted?) and within a few posts, there started a furious exchange of Bibel quotes trying to settle the case.
Yep.
I was part of that thread and was trying to explain that "theory" and "scientific theory" are two very different things and someone kept referring to me as an apeman, thinking I would get upset.
 
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