Four SpaceX tourists returned to Earth safely on Saturday after spending three days in space, successfully concluding the first orbital mission in history with no professional astronauts on board.

The SpaceX Dragon capsule, whose heat shield allowed it to withstand descent, was slowed down by four large parachutes before splashing into the Atlantic Ocean off the coast of Florida at 7:06 pm (2306 GMT), according to a video feed by the company.

"That was a heck of a ride for us, and we're just getting started," billionaire captain Jared Isaacman, who financed the trip with a goal of making space a bit more accessible, said shortly after landing.

A SpaceX boat immediately retrieved the capsule, before its hatch was opened and the space tourists, smiling broadly and waving their arms in the air, exited one by one.

They were next headed for the Kennedy Space Center, where their mission had begun on Wednesday.

The stated goal of the mission, called Inspiration4, was to encourage the democratization of space by proving that the cosmos are accessible to crews that have neither been handpicked nor in training for years.

"Congratulations @Inspiration4x !!!" SpaceX founder Elon Musk tweeted after the landing.

The four space novices -- Isaacman and three other Americans -- spent three days orbiting Earth, traveling farther than the International Space Station (ISS), at an orbit of about 575 kilometers (357 miles) high, and circling the globe more than 15 times each day.

Isaacman, who paid SpaceX tens of millions of dollars, offered the other three seats to strangers: Hayley Arceneaux, a 29-year-old nurse; Sian Proctor, a 51-year-old professor; and Chris Sembroski, 42, a US Air Force veteran.

However, the exact price that the 38-year-old founder of Shift4 Payments and seasoned pilot shelled out for the mission has not been revealed.

The Inspiration4 crew bonded over the course of six months' training, compared with years for professional astronauts.

During the flight, the members' vital signs, including heart rate, sleep, blood oxygen levels and cognitive abilities, were monitored to study the effects of space on complete novices.

But they also enjoyed the view through a brand new observation dome fitted onto the capsule, spoke with actor Tom Cruise from the vessel, ate pizza and listened to music.

- 'Second space age' -

"Welcome to the second space age," mission director Todd Ericson said at a press conference after the landing.

With its completion, "space travel becomes much more accessible to average men and women."

There was only one minor issue during the flight, with the capsule's toilet system, but a solution was quickly found, Ericson said, without giving further details.

"Best ride of my life!" Proctor tweeted after disembarking from the capsule.

The mission served as a huge fundraiser for St Jude's Children's Research Hospital, a leading facility in Tennessee. Arceneaux received treatment there as a child, and now works there.

The crew took with them various objects -- including a ukulele, which Sembroski briefly played live from the vessel on Friday -- that will now be auctioned off with proceeds going to the hospital.

The landing marked the third time that Musk's company has taken humans to space and back, after the return of two NASA missions, one in August 2020 and another in May of this year. Both were bringing astronauts back from a stay at the ISS.

Unlike NASA astronauts, the members of the Inspiration4 mission did not go to the ISS but remained in orbit around the Earth.

The space adventure comes after a summer marked by the battle of the billionaires Richard Branson and Jeff Bezos to reach the final frontier. However their separate suborbital flights only offered a few minutes in zero gravity.

SpaceX is already planning further space tourism flights. In fact, "the amount of people who are approaching us through our sales and marketing portals have actually increased significantly," said Benji Reed, SpaceX's director of human spaceflight programs.

The next trip is scheduled for January 2022, with three businessmen on board.

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What life is like aboard the SpaceX Dragon capsule
Washington (AFP) Sept 17, 2021
The first space tourism mission by Elon Musk's SpaceX blasted off from Florida on Wednesday and the four crew members - a billionaire and three other Americans - have already seen more than 25 sunsets and sunrises. SpaceX has released few details about their adventure since they reached an orbit which is more distant than that of the International Space Station. Here's what we know about their life on board: - Nine square meters - The four space tourists are aboard the SpaceX crew caps ... read more