Cooling system for a solar expedition a'la Sunprobe from the old Thunderbirds series? Heck, a really small lump might be useful to keep most spacecraft cooled. That's literally one of the issues out there, spacecraft literally have to be cooled, because there's nowhere to put the heat. Most cooling systems on Earth get to use conduction with the atmosphere to accomplish the task. There's nothing in space to conduct it to.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor