Rebecca Rubin Film and Media Reporter Does Christopher Nolan‘s “Oppenheimer” have enough heat to hit $1 billion globally? At one point, this milestone may have sounded entirely improbable for a three-hour historical drama that mostly depicts scientists talking about theoretical physics. But sure enough, the biopic starring Cillian Murphy as the so-called father of the atomic bomb has become a full-fledged blockbuster with a fighting chance at joining the billion-dollar club. After 10 weeks of release, “Oppenheimer” has earned a staggering $926 million at the worldwide box office.