Mars is a planet. The "canals" of Mars were first discovered in 1877. A Halloween radio broadcast of H. G. Wells' War of the Worlds caused hysteria in 1938 when thousands of Americans mistook the story's Martian invasion of Earth to be real and fled from cities such as New York. In 1957, Indiana Jones dismissed Irina Spalko's claim that the Roswell remains were not of human creation as "saucermen from Mars".