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Originally posted by Hanslune
but....the fossil records shows no humans. Lots of other critters but no humans until late late in the age of mammals.
We can detect life back to three billion + years, if they had a civilization similar in its use of materials as we have now, it would be detectable in the sedimentary rock.
Are you talking human or inhuman civilizations? Inhuman would be a lot more plausible
Thanks for the tip on the quoter
Originally posted by grover
Carbon 14 decays at a set and measurable rate and that rate does not change.
Originally posted by zysin5
Helium3 is used in reactors and such, and was hoping to find a link to this substance in liquid form in the reactor, tho I couldnt find enough information to properly link the two.. Your thoughts on this Borg?
Deep under African soil, about 1.7 billion years ago, natural conditions prompted underground nuclear reactions. Scientists from around the world, including American scientists have studied the rocks at Oklo. These scientists believe that water filtering down through crevices in the rock played a key role. Without water, it would have been nearly impossible for natural reactors to sustain chain reactions.
Originally posted by NuclearPaul
It fits in pretty well with the stories of advanced technology in Atlantis and ancient Egypt etc.
Originally posted by Unit541
But perhaps, and maybe just for the sake of our own future as a civilization, we should take a more optimistic perspective on these theories. Maybe these advanced civilizations, be them human or not, didn't destroy themselves. Maybe they just packed up and left when the time came. On to greener pastures as they say. Perhaps one day, we'll do the same.
we could never hope to find evidence of such a thing
Originally posted by liquidself
I have heard of the "natural" nuclear reactor in Afrika before, but I had never thought of it as anything but an odd chance occurence in nature up until I noticed this thread. But; the more I think about it the more improbable an occurence it seems.
In 1952, the late Paul Kuroda predicted that if the right conditions existed, a natural nuclear reactor system could go critical. Twenty years later, noticing that uranium ore from the Oklo mine was depleted in 235 Uranium , it was discovered that the site had once been a natural nuclear reaction system.
Originally posted by Hanslune
Please define 'Modern'
Various early civilization had running water, dentist tools but no electricity (the first sign of that is 660 AD the famous Baghdad batteries.
Do cultures run down then up? Yep The Tasmans are a good example of that as are the Chinese, Arabs and of course the Europeans gave us a good example of cyclical civilization. However at this time there is no evidence of any civilization having come up to 'modern' standards previously. We've been looking for over 130 years and still ....