Natural Satellites
When Brackett's stories were written, Jupiter was known to have twelve moons orbiting it. The four largest of these are Io (Jupiter I), Europa (Jupiter II), Ganymede (Jupiter III), and Callisto (Jupiter IV). They are among the largest moons in the solar system, and only these four are permanently inhabited. Several other moons orbit Jupiter, but none play a significant role in the stories.
Although the diminished heat of the Sun at Jupiter's distance would be expected to leave the moons cold and frozen, Jupiter's gravity causes tidal heating of the three moons' cores, causing internal heating and vulcanism.
Read more about this topic: Jupiter In The Fiction Of Leigh Brackett
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