Scientists and engineers don’t always dance to the beat of the same drum, especially when it comes to “hard rock” science — the study of intact, crystallized rocks on other planets, which may provide ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...

Anna L. Fisher, Kathryn D. Sullivan and Rhea Seddon taking a break from various training exercises at a three-day water-survival school held near Homestead Air Force Base in Florida. Smithsonian's ...