Back in the late 70’s, space artist Don Dixon did a series of paintings depicting scenes set on the moons of Jupiter & Saturn. I remember thinking how cool it would be to actually stand on one of these moons and look at the great gas giants up close. After Voyager (and other probes) sent back data on these planets in the 80’s, it seems these two planets emit high doses of radiation. This kinda makes it difficult to see these sights without suffering lots of death.
Is this a charateristic of gas giants? or do all planets emit radiation?