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A hospitable planet with seven moons

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#26: Sep 6th 2020 at 4:12:38 AM

[up][up] Septimus, what about higher surface gravity causing the planet to retain a much thicker atmosphere?

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#27: Sep 6th 2020 at 4:34:03 AM

There's more than gravity to determining the density of an atmosphere, though. Such as the composition and origin of the planet and whether the host star emits enough radiation to blow part of the atmosphere off.

More importantly, the greenhouse effect does not quite scale with atmospheric density - it is a composition dependent effect and at very high densities effects such as Rayleigh scattering begin to offset it. Plus, an overly thick atmosphere yields a gas giant, not a Super Earth.

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#28: Sep 6th 2020 at 4:46:26 AM

Well, I was assuming everything else being the same: Earth-like composition, Sun-like star, 1 AU distance, with the major difference being surface gravity 1.5x or 2x higher.

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#29: Sep 6th 2020 at 8:50:52 AM

Yeah, I should mention the setting of this configuration is for a New Adult Fantasy where the residents of this potential Super-Earth are (mostly) either superhuman hybrids or The Heartless.

So, I'm open to shortcutting some scientific/astrological pitfalls with "gods blessed this place" or "these people aren't exactly human." Not a whole lot though.

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#30: Sep 6th 2020 at 9:06:27 AM

If there are seven moons to this planet, why not continue the theme somewhat? Maybe to your culture, seven is a sacred number.

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#31: Sep 6th 2020 at 9:13:11 AM

Well, there are already seven major capitals (read: countries) planned.

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#32: Sep 6th 2020 at 9:41:02 AM

On the other hand, these moons would not have had to be around very long to become part of the culture of a new intelligent species. Maybe as little as a few thousand years. So really, there is no need for these moons to be in stable orbits. Perhaps they are all captured.

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#33: Sep 6th 2020 at 9:53:45 AM

[up] Most terrestrial moons are not formed in situ, so they are more likely to be captured.

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#34: Sep 6th 2020 at 9:58:25 AM

[up]I mean, Earth's Moon is an anomaly here as it isn't really captured per se, but it still required an exceptional event to happen.

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#35: Sep 6th 2020 at 9:04:25 PM

I remember hearing something talking about moons that our Moon is unusually large by terrestrial standards, the only place in our Solar System with a bigger moon by proportion relative to its host planet is Pluto and Charon which almost qualify for Binary Planet status.

If the host terrestrial world instead of having seven of our Moons, it had seven smaller objects that serve as moons it could do it. Yes on the surface most of those moons would be unusually large stars or small disks in the night sky with only the closest and/or largest having any meaningful effect in terms of eclipses and such.

But on the flipside, even with resonances the terrestrial inhabitants would quasi-periodically experience lunar occultations of other moons.

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#36: Sep 7th 2020 at 6:30:29 AM

At a rough approximation, the mass of the seven moons together would more or less equal that of our one moon.

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