Before she kicks off her upcoming world tour, Katy Perry is reaching for the stars. The pop icon will join Jeff Bezos’ fiancee Lauren Sanchez, journalist Gayle King and three other women on an ...

Carl Sagan spent his childhood immersed in Mars ... But in 1965 the first flyby mission to Mars returned photos of pristine rock—and nothing else. It was a gut punch. The New York Times declared ...

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 ...