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>IIRC Mars lost its atmosphere due to solar winds and lack of good protective magnetic field

Someone in the know correct me if I'm wrong, but I believe this is no longer the main theory, as solar wind ablation is too slow to make such a huge impact. I believe the popular explanation now is that geological reactions, i.e. gas reacting with rocks and being sequestered, played a larger part.

Solar wind as the culprit was still being tossed around in 2017.

https://www.nasa.gov/press-release/nasas-maven-reveals-most-... "The new result reveals that solar wind and radiation were responsible for most of the atmospheric loss on Mars, and the depletion was enough to transform the Martian climate."

Ah, maybe I read that geological processes were ruled out rather than being the main driver

Radioactivity fed? Indirectly by producing heat and motion in the core?

Titan keeps its atmosphere, in part, because of Saturn's magnetosphere. It is inside it something like 95% of the time.