The famed astrophysicist Carl Sagan and former President Jimmy ... just five years before World War II began. Had Sagan’s family remained in Ukraine, they would have been murdered in the Holocaust.

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 ...