The vantablack material would indeed "glow", as everything in the universe glows. It just does so outside the visible spectrum. The difference between this ther

The vantablack material would indeed "glow", as everything in the universe glows. It just does so outside the visible spectrum. The difference between this thermo-voltaic cell and a photo-voltaic cell is that photo is visible spectrum and thermo is IR. It's all just photons!