Is it physically possible to raise the temperature of a heat source by reflecting its heat back to itself in an open system? Can you raise the sun’s temperature that way? - TL Winslow

https://www.quora.com/Is-it-physically-possible-to-raise-the-temperature-of-a-heat-source-by-reflecting-its-heat-back-to-itself-in-an-open-system-Can-you-raise-the-sun-s-temperature-that-way/answer/TL-Winslow