SpaceX's private Polaris Dawn astronauts splash down to end historic spacewalk mission The four Polaris Dawn astronauts splashed down safely off the coast of Florida today (Sept. 15), bringing an end to their historic commercial mission. https://cdn.mos.cms.futurecdn.net/LKYeizjyaXmumE9gr84hXW.jpg https://www.space.com/spacex-polaris-dawn-private-astronaut-mission-splashdown