I just realized something.
Was reading New Scientist earlier, when I read the following article: they now have not merely thermo-electric devices, but radiation-electric devices.
That pinged in the back of my head for a bit, but it wasn’t until a moment ago when it clicked.
Oh, shit. This gives us the solar system.
How does it do that? Ion engines. A radiation-electric ion drive system lets you leave your cruising fuel on the ground… the sun, in all its deadly radioactive glory, will give you everything you need… and you’ve solved, in that same stroke, one of the biggest problems to long-term habitability.
Golevka, here I come.