Before she kicks off her upcoming world tour, Katy Perry is reaching for the stars. The pop icon will join Jeff Bezos’ ...

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 ...

Dr. Sagan, a planetary scientist who was recognized for both his ingenious scientific ideas as well as his enormous influence in popularizing space science, was a new member of the SETI Institute’s ...

Carl Sagan, the distinguished Cornell University astronomer and Pulitzer Prize-winning author, who succumbed to his battle against cancer on December 15, in fact lived for millions of years in the ...