What is the primary advantage Callisto offers for surface habitation compared to other Galilean moons?

Answer

Relative safety from Jupiter's ferocious radiation.

Callisto resides outside Jupiter’s main radiation belt due to its distant orbit, drastically cutting radiation exposure compared to Io and Europa, which simplifies initial engineering hurdles for settlement.

What is the primary advantage Callisto offers for surface habitation compared to other Galilean moons?
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