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Forum » SpaceEngine » Space Journeys » Challenge: The furthest "habitable" terra from it's star (0.9.6 only)
Challenge: The furthest "habitable" terra from it's star
TalynDate: Friday, 06.07.2012, 22:49 | Message # 1
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I was out exploring the new SE version when I came across this planet that aside from it's negligible atmospheric pressure, looked like a good candidate to colonize.



Then I realized it was only a mere 346 AUs from it's parent star shok and the surface temperature is still quite hot
The planet is no other than DENEB 8

That gave me the idea for this challenge.

Let's see if anyone can find a habitable world (with life not necessary) with a diameter above 50% of Earth, a rotation period and atmospheric pressure that we could adjust, and an axial tilt no greater than 24º to avoid major season changes.

My planet is obviously disqualified because of the low atmospheric pressure but let's see what's out there in 0.9.6 arround those new massive procedural stars wink

Attachments: 3063565.jpg(139Kb)





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Edited by Talyn - Friday, 06.07.2012, 22:50
 
TalynDate: Saturday, 14.07.2012, 16:15 | Message # 2
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Found a good candidate in a very old galaxy. It's a moon of a gas giant orbiting 801 AU away from it's parent star :O

The gas giant


The moon

Attachments: 2215460.png(435Kb) · 9093188.png(185Kb)





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dontpanicDate: Saturday, 14.07.2012, 16:37 | Message # 3
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Wow, too bad I have just seen this thread... Yesterday I was looking for a nice planet to make screens with, when I just randomly clicked on a star, then checked what orbits it. It showed 7 planets, 3 of them were terra planets, 2 of them were in the end of the system (the furthest planets away from the star). I don't remember exactly (because I was more interested in a gas giant in the middle of the system) but I think they were temperate and warm terras. I didn't check them out... Could be pretty far, I think...

Edited by dontpanic - Saturday, 14.07.2012, 16:38
 
TalynDate: Saturday, 14.07.2012, 16:52 | Message # 4
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Check your log (TAB Key)

With some luck maybe it's still there wink





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apenpaapDate: Saturday, 14.07.2012, 16:56 | Message # 5
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I'll go search for some of these really far terras later on. I've seen some Hot worlds at hundreds of AUs from O stars, though, so you could probably find habitable worlds even at thousands of AUs... But I think SE doesn't make planets beyond a certain distance, which I'm guessing is 1000 AU, even though extremely hot O stars can still warm up worlds at that distance.




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HarbingerDawnDate: Saturday, 14.07.2012, 17:07 | Message # 6
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This is a very interesting challenge. I just have one question: what exactly defines a "habitable world"? Does it have to be terra? Could it be oceania or desert as well? Does it have to have a blue atmosphere? Does it have to be temperate? Et cetera.




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TalynDate: Saturday, 14.07.2012, 17:32 | Message # 7
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I made the challenge with the parameters a bit open, because if we were to define all the parameters within 5% of earth norn the hunt would be impossible :/

I guess I wasn't thinking of oceanias when I made the challenge but even oceanias may have islands, so I wouldn't discard them off hand wink

Deserts have a tendency to be way too hot for confort, so we need a top temperature of say 312k (we could live near the poles and a botom temperature of say 252 (We could probabbly only live in the equator line)

Just throwing numbers here, but in general, the atmosphere should not be taken into consideration yet because it's not realistically moddled at this stage, so the only parameters that will disqualify a planet, are the radius (>50%), axial tilt (+-24º arround 0º or 180º) , atmo. pressure (>0.3 to 4?) and gravity (0.3 to 2?)

The values are just a base reference and can be stretched a bit if you feel that in your imagination, that particular planet/moon could be habitable smile

Let's see what's out there smile

EDIT:

Not so sure about the values of Atmo. Pressure and gravity :/
Could anyone survive below 0.3 bar while standing on a 4G world?





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Edited by Talyn - Saturday, 14.07.2012, 17:36
 
HarbingerDawnDate: Saturday, 14.07.2012, 18:00 | Message # 8
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Quote (Talyn)
I guess I wasn't thinking of oceanias when I made the challenge but even oceanias may have islands, so I wouldn't discard them off hand

Well by SpaceEngine's definition of oceania there would be no islands. So I take it you meant worlds where people could live on solid land, which would mean desert and terra.

Quote (Talyn)
Deserts have a tendency to be way too hot for confort

Mars is a desert wink

Quote (Talyn)
Could anyone survive below 0.3 bar while standing on a 4G world?

I'm not sure that anyone could survive standing on a 4g world period. I think that a maximum of 2g is good, personally I could not imagine living in 2g, I think that 1g is too much biggrin I think the minimum gravity should be lowered to 0.15-0.2g; the Apollo astronauts proved that working in that sort of environment was possible, though any less than that would probably be difficult.

I also think that 0.3 atm is a good lower bound for atmospheric pressure. If the atmosphere was purely O2 then we could exist in even slightly lower pressures, but then the slightest spark would ignite a firestorm. I'm not sure what an upper bound would be, but somewhere between 4 and 7 atm sounds good.





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TalynDate: Saturday, 14.07.2012, 18:24 | Message # 9
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Ok I was just throwing numbers smile

So just to make things clear now, the planet should be:

Class: terra or desert (if you can find water to thaw out wink )
Radius: >50% of earth
Axial tilt: <24º deviation from 0 OR 180 (retrogrades)
Atmo. Pressure: 0.3 to 7 (Ok 7 may be pushing the envelope a little but what the heck :D)
Gravity: 0.2 to 2

EDIT: Should we disqualify green atmo. planets? Because those look really toxic biggrin





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Edited by Talyn - Saturday, 14.07.2012, 18:27
 
HarbingerDawnDate: Saturday, 14.07.2012, 18:40 | Message # 10
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Quote (Talyn)
Radius: >50% of earth

Why does radius matter as long as all other parameters are correct? The radius alone would not affect whether you could live there.

Quote (Talyn)
EDIT: Should we disqualify green atmo. planets? Because those look really toxic

If we disqualify green atmospheres, then we should also disqualify Venus, Titan, and Mars atmosphere models as well, since those don't look safe to breathe either (so only white/blue atmospheres would be allowed). I guess the bigger question is should we consider atmospheric color at all or not?





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SpaceEngineerDate: Saturday, 14.07.2012, 18:42 | Message # 11
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I recommend you guys read the good book Doul S. "Planets for man" (not sure about English caption). It is a small and quite old book, but still relevant (well, physics haven't changed since 70-th). As I remember, according to Doul, suitable gravity is 0.5-1.5g, atmo pressure 0.3-3 atm, average temperatures 10-20 C, day length 12-48 hours. Actually I think his bands are too narrow. For example, I think gravity of 0.1g is suitable for life (however, a temperate-temperature planet with such gravity may not handle an atmosphere).

By the way, I think Mars can be classified as a "frozen terra", as long as it has frozen water oceans, covered by thin layer of dust. If Mars would have more water than land, the snow might cover land with a thin layer, and Mars would look like a snowball Earth. I plan to implement such types of planets in SE, so the Solar system may have two terras in a future version. smile

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ChrisDate: Saturday, 14.07.2012, 20:30 | Message # 12
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Habitable planets for man - Stephen H. Dole




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TalynDate: Saturday, 14.07.2012, 21:56 | Message # 13
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Here it is in PDF format.

Now we have some light reading for the weekend biggrin

EDIT:
I just finnished reading Chapter 2 (real page turner) but my mind is not very scientifically oriented.

Can anyone translate this table, especially the gas pressures, because I have found a website that allows us to convert everything, except I really don't know what to choose on the right side. Can any of them be directly converted to a low/high treshold of tolerable Atmo. pressure?


Attachments: 7569567.png(119Kb)





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Edited by Talyn - Saturday, 14.07.2012, 22:44
 
ExarKunDate: Tuesday, 17.07.2012, 21:41 | Message # 14
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Quote (Talyn)
Let's see what's out there


Found one and looks quite promising.
Diameter: 18,5k
Orbital period: 312d
Rotation period: 17h27''
Gravity: 0,90g
Atm. pressure: 1,62
Temp: 281K

Four moons for system missile defence complex and.... it's relatively close to Sol system... approx 340 ly smile

System coordinates: RS 8403-196-8-8397875-93 (v. 9.6.1)

Attachments: 2096687.jpg(299Kb) · 5058028.jpg(502Kb) · 8144646.jpg(477Kb) · 1012335.jpg(543Kb)


Edited by ExarKun - Tuesday, 17.07.2012, 21:44
 
TalynDate: Tuesday, 17.07.2012, 22:58 | Message # 15
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Quote (ExarKun)
Found one and looks quite promising.


0.829 AU seems a bit short of 800 AU wink





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Edited by Talyn - Tuesday, 17.07.2012, 23:29
 
Forum » SpaceEngine » Space Journeys » Challenge: The furthest "habitable" terra from it's star (0.9.6 only)
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