Armageddon

It is a seemingly normal day at NASA.  Some astronauts are repairing a satellite.  Soon after, a meteor shower comes out of nowhere.  It destroys the satellite and also hits and destroys all of New York City.  NASA discovers a Texas-sized asteroid barreling towards Earth.  If this asteroid is not stopped, all of Earth’s inhabitants will be killed off, just like the dinosaurs. 

NASA hires a group of oil drillers led by Harry Stamper (Bruce Willis).  They're sent off into deep space to implant a thermonuclear device within the asteroid - hopefully diverting it from a collision course with their home planet.