The Guzman Prize was a prize of 100,000 francs, announced by Camille Flammarion in 1891, to "the person of whatever nation who will find the means within the next ten years of communicating with a star (planet or otherwise) and of receiving a response." Communication with Mars was specifically exempted because it would not be a difficult enough challenge.  It was bequeathed by a French widow, Clara Goguet Guzman, an admirer of Flammarion's writings, in honor of her son, Pierre Guzman.