Science Nerds: Could Jupiter's Magnetic Field be harvested for energy?

[Anomalocaris]

Because it's Sience Fiction, not fantasy
It should stick to the known laws of physics or possibly add something new and explore the possibilities
(that's why I hate Star Wars.... space craft flying and banking like planes in an atmosphere, it's just wrong! Also super high tech Light Sabers that look and act like illuminated swords)

But it's not reasonable to imagine that, in 'hundreds of thousands of years', we wouldn't have a better understanding of the laws of physics, and the technologies that always follow.

All chemical elements have a half-life. In some of these, the decay is emitted as radiation. Why is it so fantastical to imagine a synthesized element that decays as electricity?

Boru

If it depends on whether the plot is about exploring what happens if one or a very few particularly irksome constraints thought to be unavoidable facets of reality turn out be susceptible to being circumvented.   But that is different from assume any known laws of physics can be superseded with a better understanding convenient to the plot whenever it is convenient to plot development.   The former is science fiction, the latter is fantasy leaching off the good name of science. 

At best, that kind of fantasy plot smells vaguely of laziness.   Aya worst it reeks of exploiting the name of science while being contemptuous of science.