Will my planet work? (size, gravity, atmosphere)

I was going to sort this all out beforehand, and then write the book, but when the writing flows... you make hay. I am a perfectionist/details-oriented person, but you lose me on math/hard science. The book is written, so now I will ask, figure this out, and hopefully not have to take a chainsaw to the thing to change what I got wrong. I do not think I am TOO far off based on a LOT of lurking here, on google and wiki...

I have a world, and I have decided I want a bigger planet than Earth, as big as possible really, without being too much different in some important ways. I wanted bigger continents, bigger oceans/seas, taller mountains, larger/taller flora, and I wanted a slightly cooler climate (for a bit more boreal and a bit less jungle). I also wanted potentially bigger creatures. Basically? more extremes. Yeah, it's an epic fantasy in a made up world and I should just write my dragons and polish my swords, but I want to please the nitpickers too. Further, this epic (medieval) fantasy has potential to go sci-fi down the road, and then I will definitely have to please the nitpickers.

So... from my research so far... this should look like a planet roughly 1.15 to 1.2 times the size of Earth (diameter), to the extreme (outer) edge of the habitable zone (this is important, more on this in a different post), with a thicker atmosphere (and more oxygen), but slightly less gravity than Earth. I figured that having less gravity vs a larger planet can be solved by having a slightly lighter core, consisting of less iron perhaps. It will have roughly the same land/water ratio as Earth.

If it helps/hinders the post, i'll also mention that the planet has a VERY large moon (again, big as possible), OR... it might even be the satellite of a gas giant, maybe even a brown dwarf? I'm not picky on this one, i just want the big moon. It also has another moon, same as our own, and then a smaller third.

So... actual question:

Will my planet template work? Scientifically plausible? Almost plausible?

First time here and great site.

Thanks.

posted over 4 years ago

Adversary‭

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