Keeping the Interior of Your Rover Cool

The inside of a lander is going to be cooled from space. But over time, it's going to get hotter and hotter and hotter. And when you get to the point where the heat is so hot that it boils, that it will boil, melt lead, that you need to protect your lander against that heating. So they thought if you took a powerful enough power source, like obviously like some kind of reactor that you could run a sterling engine  that's purely designed to transfer heat around. You could actually keep the interior of your rover cool enough long enough that it would be able to survive on the surface of Venus for weeks or even days.