SpaceX is about to perform its most ambitious test-launch yet of a shiny Mars rocket prototype. The prototype is built out of stainless steel and is equipped with one of SpaceX's next-generation Raptor rocket engines. Company founder Elon Musk named the roughly six-story-tall rocket ship "Starhopper," says Business Insider. Engineers hope to take the vehicle up to about 65 feet on Tuesday. Musk tweeted that there will be live-streaming video of the launch.