Historic private astronaut mission splashes down off Florida

The SpaceX Polaris Dawn mission, which made history when its crew conducted the first spacewalk by non-government astronauts, splashed down off the coast of Florida early Sunday.

The Dragon spacecraft landed in the ocean at 3.37am, a webcast of the splashdown showed, with a recovery team deploying in the pre-dawn darkness to retrieve the capsule and crew.

The four-member team led by fintech billionaire Jared Isaacman launched on Tuesday from the Kennedy Space Center, quickly journeying deeper into the cosmos than any humans in the past half century as they ventured into the dangerous Van Allen radiation belt.

They hit a peak altitude of 1,400km —more than three times higher than the International Space Station and the furthest humans had ever travelled from Earth since the Apollo missions to the Moon.

Then on Thursday, with their Dragon spacecraft's orbit brought down to 434 miles, Isaacman swung open the hatch and climbed out into the void, gripping a structure called "Skywalker" as a breathtaking view of Earth unfolded before him.

"SpaceX, back at home we all have a lot of work to do, but from here, Earth sure looks like a perfect world," he told mission control in Hawthorne, California, where teams erupted in applause.

He went back inside after a few minutes and was replaced by a second astronaut, SpaceX engineer Sarah Gillis, who, like Isaacman, performed a series of mobility tests on SpaceX's sleek, next-generation suits.

Since Dragon doesn't have an airlock, the entire crew were exposed to the vacuum of space. Mission pilot Scott Poteet and SpaceX engineer Anna Menon remained strapped in throughout as they monitored vital support systems.

The final Polaris mission aims to be the first crewed flight of SpaceX's Starship, a prototype next-generation rocket that is key to Musk's interplanetary ambitions.