| Cave planet | |
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| Tweet Topic Started: Jan 29 2014, 11:35 AM (101 Views) | |
| Zireael | Jan 29 2014, 11:35 AM Post #1 |
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A/N: Restarting my project from the SpecEvo boards, hoping for more feedback. This was originally for a fantasy story/RPG that I abandoned due to lack of time. And I know nothing about science. *** The structure of the planet (kudos to Holbenilord from SpecEvo) ![]() ![]() Environmental conditions - Surface non-inhabitable, rocky. The planet has a high eccentricity (0.2) and therefore the conditions on the surface vary wildly. - The crust separating the inhabitable zone from the surface is thick enough that no being has ever dug through it, no technology on the planet would allow it. - The internal structure of the planet is similar to Jupiter's moon Europa, but with a thinner mantle, a bigger inhabitable zone and a thicker crust. (see diagrams above) - The caverns are vast (miles in every direction) - Temperature range under the surface: from -15 degrees Celsius (furthest from the core) to 50 degrees Celsius (still habitable space the closest to the core). Various biomes in the caverns - from subsurface lakes/oceans to desert-like caverns and underground jungles. - Week length - 8 days. Year length - 416 days (assuming 52 weeks per year) => 1.09 AU orbit with a G-type star, the planet is at 0.8 AU in periphelium and 1.308 AU in apophelium. It practically fits in the habitable zone (0.82 AU to 1.2 AU). - Rotation period 20-24h. - Density ~3 g/cm3. Diameter 7250 km (0,56*Earth's) gives us 0.31 G (Earth gravity) on the surface. - Water exists in liquid state below the surface. Life on the planet - Animal and plant life exists. There is no dirt as such, plants derive their sustenance from rocks themselves. - Photosynthetic/chemosynthetic organisms exist, giving the max luminescence in the cavernscape around civil-twilight level, ~3-4 lux - and a possible "starry sky" effect. After all, we humans experience such conditions for longer periods of time in areas affected by midnight sun/polar night. - Possible modes of vision used: di- or trichromatic life? Or would they be monochromatic all, since color wouldn't be necessary? Or maybe they'd be tetrachromatic in order to be able to pick up IR? Intelligent humanoid life - Intelligent humanoid life exists. Technology level roughly equivalent to Middle Ages (with some minor exceptions). |
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| Zireael | Jan 29 2014, 11:42 AM Post #2 |
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Questions: - how does gravity increase when getting closer to the planet's core? - can we have changeable gravity reference point in a plausible way? - how does axial tilt influence seasons? would we have seasons with a tilt of 90 or 1? The only thing I found is this link |
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| martiitram | Jan 29 2014, 03:30 PM Post #3 |
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Very Active Member
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Cool! |
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| Olympianmaster | Jan 30 2014, 06:36 AM Post #4 |
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Very Active Member
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I'm not sure, but I think our tilt is 90, and how bigger the tilt, the more influenced the seasons. |
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