[Space] Steampunk Firefly Idea

[Daigoro]

At least there's a reasonable justification for all three moons to be habitable and life-bearing if just one is- lithopanspermia. Basically, ejecta from meteor impacts allow biological material to be shared between planets or moons.

You could posit that volcanoes or even violent storms could achieve the same function, and I was thinking about some kind of organism that had adapted to spending a period in space travelling between the moons.