Life-Bearing Celestial Bodies

[Assaltwaffle]

Normally we treat life-bearing bodies as Earth-like in size. However, during StarCraft 2 there is a life-bearing moon. It is green and has a breathable atmosphere, but it is orbiting a gas giant. Would this be moon-sized? Earth-sized? Or somewhere in between? The way I see it three possible sizes are usable.

Earth size: 12742 km diameter

Ganymede (Largest moon of Jupiter): 5262 km diameter

The Moon: 3474 km diameter

Any help would be appreciated, this info is needed to determine which end needs to be used for this calc.

 

[Amelia_Lonelyheart]

I would be okay with using Ganymede in this instance personally. Though for other life-bearing moons, I have no idea.

 

[The_Everlasting]

@Dark

The only other example I can think of is Endor's forest moon, though that has official parameters anyway.

This seems rare enough to where I think we can just put a case by case basis on it.

 

[Amelia_Lonelyheart]

Theirs a feat in the 2017 Voltro comics where a Monster destroys a moon containing at least one civilization, and of course Thanos is from the Moon of Titan, but yeah it's pretty rare all things considered.

Case by case depending on what kind of planet it orbits I guess. If it's Earth-like, then we assume Luna, if a gas giant, Ganymede I suppose.

 

[Assaltwaffle]

Alright, so I'll assume Ganymede size (which was my mid end) as the size.

 

[Antvasima]

Ganymede seems fine to me as well.