The War of the Worlds (radio drama) the show in its "Leading Events of the Week" ("Tonight – Play: H. G. Wells' 'War of the Worlds'") and published a photograph of Welles with some of the Mercury players, captioned, "Tonight's show is H. G. Wells' 'War of the Worlds'". Announcements that "The War of the Worlds" is a dramatization of a work of fiction were made on the full CBS network at four points during the broadcast October 30, 1938: at the beginning, before the middle break, after the middle break, and at the end. The middle break was delayed 10 minutes to accommodate the dramatic content.
The War of the Worlds 1900 echo scientific ideas of the time, including Pierre-Simon Laplace's nebular hypothesis, Charles Darwin's theory of natural selection, and Gustav Kirchhoff's theory of spectroscopy. These scientific ideas combined to present the possibility that planets are alike in composition and conditions for the development of species, which would likely lead to the emergence of life at a suitable geological age in a planet's development. By the time Wells wrote "The War of the Worlds" there had been three centuries of observation of Mars through telescopes. Galileo in 1610 observed the planet's phases, and in 1666 Giovanni Cassini identified the polar ice