The moons/comets do not have this problem, although some have specific problems (e.g., Europa is in Jupiter's intense radiation bands).
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---by who?---> Nuclear power is believed by some to be the only suitable power source for the colonies, although there have been proposals to use concentrated starlight/sunlight and the gravitational potential energy of planets or dwarf planets with moons.
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Its radiation would deliver about 3,600 rems per day to unshielded colonists on Io and about 540 rems per day to unshielded colonists on Europa.
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