Richard Branson will take a rocket-powered space plane on a 2,400 mile-per-hour ride to the edge of space this weekend. That’s if everything goes according to plan. And there’s plenty that could go wrong.Richard Branson will take a rocket-powered space plane on a 2,400 mile-per-hour ride to the edge of space this weekend. That’s if everything goes according to plan. And there’s plenty that could go wrong.