[Space] Panspermia and the Campgaign

[Anthony]

Originally Posted by whswhs

What scale of agriculture or mining?

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.

[whswhs]

Originally Posted by Anthony

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

[scc]

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)

[Nereidalbel]

Originally Posted by scc

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!

[scc]

Originally Posted by Nereidalbel

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

[Nereidalbel]

This week's Cosmos actually gives you a viable means of panspermia, which requires zero handwaiving on your part.

[dcarson]

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