The fanciful Martian megafauna,” John Updike wrote many years later for this magazine, “were swept into oblivion.” Sagan was ...

NASA aims to travel to the moon again—and beyond. Here’s a look at the 21st-century race to send humans into space.

National Geographic’s “Mars” has a split personality. It isn’t a documentary, at least not entirely. It’s not a drama, either. {{description}} Email notifications are only sent once a day, and only if ...