05-18-2014, 05:03 AM | #51 |
Join Date: Jun 2006
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Re: [Space] Panspermia and the Campgaign
The hydrocarbon analogs are siloxanes. The monomer unit isn't -C- but -Si-O-, and they can form fairly long polymers, and rather complicated other structures (the 5 unit rings, and the cubane analog are both fairly stable, and give you a fine core for building elaborate structures around). Though the ones more interesting to us are silicones, mixed things with Si-O- backbones but carbon chains hanging off the other two bonds from the silicon.
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05-18-2014, 12:14 PM | #52 | |
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Re: [Space] Panspermia and the Campgaign
Quote:
I'm saying that human intelligence is incredibly rare if it's only occurred once on a known life giving planet in 4.54 billion years. To the best of our knowledge and archaeological research.
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05-18-2014, 12:18 PM | #53 | |
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Re: [Space] Panspermia and the Campgaign
Quote:
Not absolutely conclusive, but enough to strongly suggest wishful thinking on the "pro-life" crowd.
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05-18-2014, 12:24 PM | #54 | |
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Location: Lawrence, KS
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Re: [Space] Panspermia and the Campgaign
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It will have to be really close observation, though. Suppose you observed Earth, say, a quarter millennium ago. What signs of intelligence could you spot from a modest interplanetary distance, let along from parsecs away? Bill Stoddard |
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05-18-2014, 03:20 PM | #55 | ||
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Re: [Space] Panspermia and the Campgaign
Quote:
Quote:
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05-18-2014, 05:02 PM | #56 | |
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Re: [Space] Panspermia and the Campgaign
Quote:
And I think "...to the best of our knowledge and archeological research..." is a huge hole in that statement.
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05-18-2014, 05:43 PM | #57 |
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Re: [Space] Panspermia and the Campgaign
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05-18-2014, 06:06 PM | #58 |
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Location: Berkeley, CA
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Re: [Space] Panspermia and the Campgaign
Using what level of technology? The most visible stuff is probably agriculture and mining activity, either of which could be detected at several AU by the equivalent of a high end TL 8 telescope.
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05-18-2014, 06:22 PM | #59 | |
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Location: Lawrence, KS
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Re: [Space] Panspermia and the Campgaign
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Bill Stoddard |
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05-18-2014, 06:26 PM | #60 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Space] Panspermia and the Campgaign
Earth 250 years ago, as you specified, though even 5,000 years ago you'd be able to detect and at least recognize as odd agricultural patterns in areas such as the Nile. TL0 wouldn't be visible from space, but TL 1+ won't hide at interplanetary distances.
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evolution, space, system generation |
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