CAPE CANAVERAL, Florida – SpaceX’s Falcon Heavy rocket, the most powerful launch system on Earth, roared into the sky on Tuesday afternoon atop a pillar of smoke. The rocket’s three reusable boosters lifted the vehicle skyward, sending Elon Musk’s personal Tesla Roadster on a journey toward Mars orbit. Musk, SpaceX’s founder, was worried that the experimental 23-story rocket might explode with the force of […]