SpaceX CEO Elon Musk. Yichuan Cao/Getty Images SpaceX's Starship rocket is scheduled to have its first high-altitude flight test next week. The spacecraft will fly 15 kilometres (50,000 feet) into the air. Previous prototypes have only made short hops of a few hundred metres. CEO Elon Musk said there was a lot that could go wrong, and gave the rocket a 1-in-3 chance of landing in one piece. Visit Business Insider's homepage for more stories. Next week, Elon Musk's space-exploration company SpaceX will take a big step forward in its quest to fly people to Mars.Musk tweeted on Tuesday that SpaceX's enormous Starship spacecraft – which the company eventually wants to use to get humans to Mars – will undergo its first high altitude test next week.