A newly unearthed essay, "Are We Alone in the Universe," by Winston Churchill reveals he was open to the possibility of life on other planets. In 1939, a year following the radio broadcast of Ortson Welles' War of the Worlds with World War 11 breaking out, Churchill discussed the concept of habitable zones more than 50 years before the discovery of exoplanets. Churchill's thinking mirrors many modern arguments in astrobiology and builds on the Copernican Principle - the idea that human life on Earth shouldn't be unique given the vastness of the Universe.