2. That would also presumably work on earth, unless it somehow relied on low-gravity, and would also be cheaper to benefit from on earth.
The problem for 1 is how do you dissipate heat without being in contact with a lower temperature mass.
Creating a vacuum on earth would solve nothing as the heath would still have to escape the vacuum.
2. That would also presumably work on earth, unless it somehow relied on low-gravity, and would also be cheaper to benefit from on earth.