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ak_aramis 09-30-2011 06:14 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by Malenfant (Post 1255875)
Kepler has detected (but not confirmed) smaller bodies, down to about Mars sized, in a couple of cases.

There appears to be a lot of Superearths out there, but the numbers of smaller (more earth-sized) bodies does at the moment does appear to be lower even though they should be detectable. For now it looks like Superearths and Mini-Neptunes are slightly more common than smaller bodies. (of course this could change as more data comes in - that's science for you).

Just as Jupiter appears to be on the small side when it comes to gas giants, it looks like Earth is on the smaller side when it comes to terrestrial planets. In fact, Earth is on the lower end of world sizes that can sustain plate tectonics for geologically significant periods of time.

So maybe Superearths are going to be more common in the habitable zone, for all that entails.

more than 900 terrestrial sized planets around F,G, and K type size V stars with periods under 42 days. The ones around the dimmer end may actually be in the goldilocks zone...

And if Luna had been in any way life bearing, Apollo would have been the start of the colonization rush. If Mars had been life bearing, the corporate rush from the US drug industry would have driven NASA to get there by hook or crook...

People have an intense desire to expand their territory. It's stupid, and while a person may be smart, people are stupid, dangerous and prone to panic-reactions. As well as other collective stupidities that are obviously not economically advantageous but are individually neutral or even beneficial. See also runs on banks, the accession and colonization of Alaska first by the Russians then the Americans, the similar patterns for Hawaii.

People are trying to come up with ways to build domed cities in the Russian Wilderness, floating cities at sea, and submerged cities under the sea. Those are equally as stupid as orbital cities... and without the view... in the long term survival of the species. Our survival as a species or even genus (for long-term colonies will likely result in speciation) demands we get our genetic material where it can't all be killed by one 50-mile diameter hunk of rock.

combatmedic 09-30-2011 06:55 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by Running Wolf (Post 1255913)
At least for North America and colonization from England the driving force was social. The powers in Europe wanted to get rid of the radical religious elements (this is not a flame).

That's certainly part of it, yes. I suggest that you are overlooking the importance of naval stores, land shortages and labor glut in some European countries, the need to secure to transoceanic trade routes, etc.

Religion also fails as an explanation for Virginia, which predates the New England colonies and is arguably more important to the English economy in the 17th Century.

I'm not discounting ideology.I'm simply saying that these colonial ventures do have significant economic aspects, and that only looking at one factor, like religion, is a good way to miss a lot of other very important things.

combatmedic 09-30-2011 07:22 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by Running Wolf (Post 1256015)
China has a burgeoning space program.

I trimmed the quote , but I'll reply to the whole thing now.

I didn't mention China and India because I assumed that you didn't include those as part of 'The West.'


I agree that several Asian states have significant potential for the development of space based industry.


While I am very skeptical about the prospect of terraforming, I also think that it would be wise to invest in economic development of extraplantery resources. We could do quite a lot with robots and space stations. Mass drivers in orbit or perhaps on the Moon would be a good idea. Unmanned vessels could haul cargo between Earth and other planets.

I do think that some humans will probably live and work off-world, but I don't see much point in building large space colonies. There's no real incentive to do so. Social pressures might drive a few ideological oddballs to create off-world habitats, perhaps. More likely, humans living in space stations will be technicians and workers who are regularly rotated between Earth and spacefor reasons of health and comfort.


Private enterprise could certainly be involved. If no one is making money off the 'colonies', they probably won't be created, or won't last. I wouldn't be surprised if partnerships between states and for-profit-corporations played a major role.


I'm not talking about 'sufficently advanced technology', alternate physics, or extremely far future stuff. I'm talking about a plausible projection based on not only our current understanding of phsyics and our current technology, but on realistic economic and social considerations.

What any of that has to do with Traveller....

Well, it would all be useful for developing the history, economics, political system, etc a minor human race that had no direct contact with the major races until recently, and was confined to a single solar system.

combatmedic 09-30-2011 07:45 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by ak_aramis (Post 1256110)
People are trying to come up with ways to build domed cities in the Russian Wilderness, floating cities at sea, and submerged cities under the sea. Those are equally as stupid as orbital cities... and without the view... in the long term survival of the species. Our survival as a species or even genus (for long-term colonies will likely result in speciation) demands we get our genetic material where it can't all be killed by one 50-mile diameter hunk of rock.



We can deal with 'hunks of rock', as they come at us without leaving the Earth in large numbers. It is a danger, of course.The odds of such an event wiping us out are infinitesimal. We'd do better to worry about dangers like nuclear war, massive plagues, rampant human destruction of habitat, climate change accelerated by human industrial activity, etc. Those are real dangers to the species in the next few centuries or millennia.


In the really long term, of course, we are all going to die. Not only are we each doomed to die as individuals, but our species will become extinct at some point. On a long enough scale of time, everything dies. Stars die. While it would be nice for our species to stick around longer, I think we've missed the point of being alive if we think we can survive as a species forever. We can't.

I'm not suggesting that we don't colonize other worlds, if we develop a way to reach other life bearing planets (assuming that such places exist and can be reached- which may be possible with STL colony ships and deep space telescopes).

I'm just pointing out that, in the end, everything dies. That makes temporary (if prolonged on a historical timeframe) survival a worthy but ultimately insufficient goal .

What's important, beyond temporary survival a species? Science cannot give any answer. This is where religion, philosophy, the humanities, art, etc. come in.


YMMV

Anthony 09-30-2011 07:59 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by combatmedic (Post 1256148)
We can deal with 'hunks of rock', as they come at us without leaving the Earth in large numbers.

It requires somewhat related tech, but it's a lot cheaper to send out an asteroid deflector than to send out even a single major habitat.

combatmedic 09-30-2011 08:09 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by Anthony (Post 1256157)
It requires somewhat related tech, but it's a lot cheaper to send out an asteroid deflector than to send out even a single major habitat.

Yeah, I agree.

ak_aramis 09-30-2011 08:45 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by Anthony (Post 1256157)
It requires somewhat related tech, but it's a lot cheaper to send out an asteroid deflector than to send out even a single major habitat.

Cheaper, but far less assured of survival of the species. A station with supplies for 2 years should be able to wait out the year or two of destruction expected from the impact of a largish asteroid.

At present, we don't have the knowledge to assure a deflection (Or so NASA sources have repeatedly asserted), in part because we don't know enough about those asteroids. We've several theories, but, as yet, insufficient data to know which methods will be successful in redirect, which will result in fragmentation, and which simply will fail.

Malenfant 09-30-2011 11:06 PM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by ak_aramis (Post 1256110)
more than 900 terrestrial sized planets around F,G, and K type size V stars with periods under 42 days. The ones around the dimmer end may actually be in the goldilocks zone...

Where did you get those numbers from? They sound rather optimistic.

As of Feb 2011 (the last big data release), Kepler had found 68 earth-size candidates, and 288 superearth candidates (and 662 Neptunes, and 165 Jupiters): http://kepler.nasa.gov/multimedia/ar...s/?ImageID=125. As of now only 21 Kepler planets are actually confirmed.

In total so far, from other sources, we've discovered 687 exoplanets. http://exoplanet.eu/catalog.php

ak_aramis 10-01-2011 12:04 AM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by Malenfant (Post 1256231)
Where did you get those numbers from? They sound rather optimistic.

As of Feb 2011 (the last big data release), Kepler had found 68 earth-size candidates, and 288 superearth candidates (and 662 Neptunes, and 165 Jupiters): http://kepler.nasa.gov/multimedia/ar...s/?ImageID=125. As of now only 21 Kepler planets are actually confirmed.

In total so far, from other sources, we've discovered 687 exoplanets. http://exoplanet.eu/catalog.php


Traub, Sept 2011
http://arxiv.org/PS_cache/arxiv/pdf/...109.4682v1.pdf
linked to from
http://www.universetoday.com/89237/h...un-like-stars/

Malenfant 10-01-2011 12:34 AM

Re: Terraforming the Solar System
 
Quote:

Originally Posted by ak_aramis (Post 1256244)

I was talking about planet candidates (based on observation, that may or may not be confirmed eventually), Traub is talking about predicted planets extrapolated from observation.

We have not observed 900 earthsized planets around F/G/K stars, and implying that we have is misleading.


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