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DBrentOGara [2019-03-22 04:48:12 +0000 UTC]

Rylar looks good! I'm a big fan of M class planets! Beautiful worlds, nice places to visit, I'm sure.

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kingdragon01 [2019-03-21 19:40:28 +0000 UTC]

Looks very nice

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GrantExploit [2019-03-14 01:11:05 +0000 UTC]

Hmm... Here are a couple clarifications/bits of information and questions with regard to this system:

"Its climate ranges from temperate to tropical to arid." Great! Keep in mind, though, that "arid" carries no temperature connotations. For example, both Reggane and the shores of Lake Vanda (noisy climate data here ) are arid, but it's almost certain that Reggane's lowest mid-summer temperature ever is below Lake Vanda's highest ever recorded. All a climate needs to be arid is to have precipitation below potential evapotranspiration , leading to a net negative water balance. This figure increases with temperature, which is why, for example, Yakutsk is richly forested even though it receives less precipitation than Tucson .

"[Ri]... has small rivers of liquid methane." The problem with that is that methane boils at -161.5 °C (-258.7 °F), almost certainly below any temperature any planemo  not tidally-locked to its star and describable as "habitable" could reliably reach under any natural circumstances. It's hard to imagine how any planemo capable of such temperatures could exist right by such an Earth-like planet—it would at least require an exceptionally-reflective atmosphere beyond anything that has been observed, but the existence of such is disproven by the image. So, perhaps it could have rivers of heavier hydrocarbons?

With regards to Ree (uncertain how that's supposed to be pronounced differently from Ri ) and Ro, why didn't the Rylarin settle there first instead of Ri if they have a breathable atmosphere, liquid water, and (some) vegetation? Also, while the atmosphere of Ree and Ro could be relatively thin compared to the Earth's, it would be relatively thick when compared to Mars's*, requiring them to either be heavier than Mars or have other very favorable attributes encouraging the retention of an atmosphere (e.g. a strong magnetic field), but in any case could not be much smaller than Mercury. Mars is heavy enough that if it were Earth's moon, Earth could end up tidally locked to it, resulting in a very long day-night cycle for both bodies and encouraging high diurnal temperature variation. Especially for Ri, which must be even heavier, I worry that Rylar could experience the same fate. So, just how massive do you think Rylar, Ri, Ree, and Ro are?

*Assuming the Rylarin have a body temperature like that of Terran endothermic species and a metabolism comparable to humans, the atmospheric pressure there must be at least 0.07 atm. The reason is that at least 0.0618 atm is required to prevent water (thus blood and other bodily fluids) from boiling at 37 °C (98.6 °F) in what's called the Armstrong limit , beyond which pressure suits must be worn, and an oxygen partial pressure of 0.07 atm is equivalent to that of the "death zone " (~8,000 m [~26,240 ft]) in Earth's atmosphere beyond which indefinite survival is impossible even for extremely acclimated individuals. However, the atmospheric pressure should be greater as a buffer, especially to provide thermal inertia to reduce diurnal temperature variation which could result in literally boilingly-hot temperatures during the day and killing frosts every night. I mean, this  is a climate that I designed to be largely representative of the average for a world with an average atmospheric pressure of 0.379 atm, with this  being an example of an extreme climate on it.

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suburbantimewaster [2019-03-11 19:55:40 +0000 UTC]

Rylar both looks and sounds like a beautiful planet!

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