The Lord Of Uraniborg: A Biography Of Tycho Brahe ★ <Direct>

He famously wore a replacement made of gold and silver (though research suggests it was likely brass).

Tycho lost part of his nose in a sword fight over a mathematical formula. The Lord of Uraniborg: A Biography of Tycho Brahe

His data showed comets moved through the planetary spheres, proving they weren't atmospheric phenomena. He famously wore a replacement made of gold