you would need to have created a snapshot beforehand.

Then you could restore to the last snapshot. But you would need a live system to do that, if your installation is broken

i’ve used windows and linux on separate drives in the same desktop for ages and it’s been working fine.

I’m using windows mostly for games that aren’t available natively and don’t work via wine/proton

Deep space probes are already nuclear power sources.

Right now this is mostly a radio isotope heat source and a peltier device to convert the temperature differential to electricity.