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Old 05-18-2014, 08:55 PM   #61
whswhs
 
Join Date: Jun 2005
Default Re: [Space] Panspermia and the Campgaign

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Originally Posted by Anthony View Post
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.
Okay, fair, for interplanetary distances. And I'll stipulate the Nile as looking odd a long way back, though I'm not sure if extraterrestrials would look at it and say "agriculture!" rather than just "anomalous growth pattern!"

Bill Stoddard
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Old 05-20-2014, 12:48 AM   #62
scc
 
Join Date: Mar 2013
Default Re: [Space] Panspermia and the Campgaign

Is 3.7 billion years too you for this system? I think I can up the age with out too many consequences, from so playing around it looks like the biggest one is that I'll have to switch two planets orbit to keep a planet habitable (It will likely be outside to habitable zone, with the change, but the planet two orbits in will now enter the habitable zone)
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Old 05-20-2014, 03:48 AM   #63
Nereidalbel
 
Join Date: May 2013
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Default Re: [Space] Panspermia and the Campgaign

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Originally Posted by scc View Post
Is 3.7 billion years too you for this system? I think I can up the age with out too many consequences, from so playing around it looks like the biggest one is that I'll have to switch two planets orbit to keep a planet habitable (It will likely be outside to habitable zone, with the change, but the planet two orbits in will now enter the habitable zone)
Probably not. As long as you've passed the stage of massive asteroid bombardments and planets have cooled enough to form solid crusts, life can begin. Just add water and a few amino acids!
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Old 05-20-2014, 04:55 AM   #64
scc
 
Join Date: Mar 2013
Default Re: [Space] Panspermia and the Campgaign

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Originally Posted by Nereidalbel View Post
Probably not. As long as you've passed the stage of massive asteroid bombardments and planets have cooled enough to form solid crusts, life can begin. Just add water and a few amino acids!
Panspermia does solve a few problems, even if it does raise some questions in it's wake, but it will also require more time
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Old 05-20-2014, 03:38 PM   #65
Nereidalbel
 
Join Date: May 2013
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Default Re: [Space] Panspermia and the Campgaign

This week's Cosmos actually gives you a viable means of panspermia, which requires zero handwaiving on your part.
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Old 05-20-2014, 04:57 PM   #66
dcarson
 
Join Date: Mar 2008
Default Re: [Space] Panspermia and the Campgaign

Spectroscopic examination of the atmosphere might spot mining and smelting sooner than you see agriculture.
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