08-12-2022, 07:45 PM | #21 | |
Join Date: Aug 2007
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Re: Number of habitable worlds within170 light years?
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This is because tidal drag has acted on the Earth-Moon system as a whole and not either body individually. The Moon moves farther away from the Earth as a consequence. The Moon is beleived to have formed _much_ closer. Even without any tidal effects Venus still seems to ahve a molten core. Without a relatively large companion moon I'd expect a planet in Earth's position to have a much longer day that might be a signioficant problem. The msot common habitable planet-type mnight be a sort of "Super-Mars". This would be a planet in Mars relative position that has maintained a moltent core through its' larger size and a day of reasonable length through its' distance from its' star. Then youu have a thick atmosphere and geothermal heat combining to keep your Super-Mars above the freezing point of water at its' surface.
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Fred Brackin |
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08-12-2022, 10:20 PM | #22 | |
Join Date: Aug 2014
Location: Canada
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Re: Number of habitable worlds within170 light years?
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The intention is to fill the area with approximately 200 lightly detailed places most of which will be habitable worlds than if they leave the play area have some extra worlds to plop down in their way as needed The issue is more to do with it feeling full since this is more of a space opera type place. I can also detail many ruined worlds as well since this is a universe where interstellar civilization has collapsed (far future apocalyptic?)
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Oliver. |
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08-13-2022, 12:15 AM | #23 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Number of habitable worlds within170 light years?
Bear in mind that there's something like a million star systems in that distance.
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08-13-2022, 12:43 AM | #24 |
Join Date: Aug 2004
Location: Seattle, WA USA
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Re: Number of habitable worlds within170 light years?
A useful tool you might consider is the article at the Atomic Rockets site on Interstellar Empire Math. It lays out the details of how the numbers were developed so that you can work with your own assumptions, too. Really, the whole Atomic Rockets site is an incredibly useful resource, but those formulas are particularly useful for the purpose you have here.
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08-13-2022, 02:25 AM | #25 | |
Join Date: Aug 2004
Location: Pioneer Valley
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Re: Number of habitable worlds within170 light years?
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Given that people are kicking around various possibilities, perhaps the OP would define "habitable" for the purposes of argument. Just-like-Earth, temperate zone? 100 degrees in the shade, requires supplemental oxygen, 1.75 G?
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08-13-2022, 01:05 PM | #26 |
Join Date: Aug 2014
Location: Canada
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Re: Number of habitable worlds within170 light years?
Variety of worlds humans could visit and breathe, with hoth-like North pole planets , all the way to sahara tatooine desert planets—- but all breathable oxygen worlds.
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Oliver. |
08-13-2022, 01:07 PM | #27 |
Join Date: Aug 2014
Location: Canada
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Re: Number of habitable worlds within170 light years?
Everyone gives different numbers. A million worlds wouldnt work at all obviously, so might bring it down to a smaller area in order to reduce it
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Oliver. |
08-13-2022, 01:09 PM | #28 | |
Join Date: Aug 2014
Location: Canada
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Re: Number of habitable worlds within170 light years?
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Oliver. |
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08-13-2022, 02:02 PM | #29 |
Join Date: Dec 2007
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Re: Number of habitable worlds within170 light years?
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08-13-2022, 04:03 PM | #30 | |
Join Date: Mar 2013
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Re: Number of habitable worlds within170 light years?
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You see, one of the first FTL ships from Earth misjumped and landed around 5,000,000 years in the past with everybody and everything pretty much smashed. The aliens (methane breathers, long gone by the time of the game) decided that in thanks for the secret of the FTL drive, they would terraform the galaxy for us (it was a religious obligation to them). They didn't get more than a few percent done but it was enough to really confuse the human scientists when we go out there. And most of the planets held life that was sort-of earth-like. The aliens (the forerunners) have been gone for about 4,000,000 years now. There are so few traces of them that we know almost nothing about them.
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