SpaceX's Falcon 9, the company's current workhorse rocket, is only partially reusable as some of its hardware is still destroyed after launch. SpaceX on Saturday will attempt to land its Starship spacecraft for the first time, an engineering feat that would help fulfill Elon Musk’s pledge to make the massive rocket fully reusable. Elon Musk’s company will try to grab both parts of the rocket for the first time.