This story appears in the August 2017 issue of National Geographic magazine. Carl Sagan spent his childhood immersed in Mars. The future scientist, an avid reader of Edgar Rice Burroughs’s ...

Carl Sagan had a bone-chilling prediction about America in 1995. A passage from his book, The Demon-Haunted World, is now trending online a day after Donald Trump’s presidential inauguration.

Carl Sagan, the astronomer, Pulitzer Prize-winning author, and legendary popularizer of science, gave this interview during the making of "Time Travel." True to form, he discusses arcane aspects ...