cbs' mark strassmann has been monitoring it all from the kennedy space center. good evening, mark. >> reporter: errol, this crew just became the most successful tourists in space history. they splashed down off the coast of florida from the pad behind me where they launched on wednesday. a three-day camping trip in the cosmos ended with a splash off the florida coast. >> inspiration4, on behalf of spacex, welcome home to planet earth. >> reporter: inspiration4, a space voyage like no other. not a single professional astronaut aboard. that itself is not new. but by orbiting the earth in a spacex capsule 15 times a day... >> we're seeing the world every 90 minutes. >> reporter: ...the civilian crew did circles around previous adventures in cosmic tourism. mission commander jared isaacman, the billionaire who sharterred the flight. >> a big part of our mission here in inspiration4 is to inspire what can be done here in space. >> reporter: the wow factor