HE'S ALREADY BEEN ON ONE MISSION. NOW THE SECOND ONE. THIS ONE IS VERY HIGH STAKES. >> THREE, TWO, ONE! >> Reporter: ROARING OFF THE LAUNCH PAD IN THE EARLY MORNING HOURS, AN ALL COMMERCIAL GROUP OF SPACE EXPLORERS RIDING IN A SPACEX DRAGON CAPSULE AND DETERMINED TO BREAK RECORDS, FLYING HIGHER THAN ANY HUMANS IN 50 YEARS AND THE FIRST COMMERCIAL CREW TO CONDUCT A SPACE WALK, WHILE TESTING NEW SPACE SUITS THAT MIGHT ONE DAY BE USED FOR SPACEX MISSIONS TO THE MOON AND MARS. >> MAYBE NOT NOT-TOO-DISTANT FUTURE HUMANS WILL REACH A PLANET NOT THEIR OWN. >> Reporter: PILOT SCOTT, A VETERAN AIR FORCE FIGHTER PILOT. MISSION SPECIALIST SARA GILLIS, A SPACEX ENGINEER. AND A MEDICAL OFFICER. THE MOST DANGEROUS PORTION OF THE MISSION, THAT SPACE WALK. TO DO IT, THE ENTIRE SPACESHIP WILL BE OPEN TO THE VACUUM OF SPACE WITH EVERYONE SUITED UP. THEY TALKED ABOUT IT HERE ON TODAY. >> IT WILL BE ABOUT A TWO-HOUR OPERATION OVERALL. ALL OF US WILL GET SUITED IN THESE BRAND-NEW SPACE SUITS BEFORE WE VENT THE SPACECRAFT AND GO OUTSIDE. >> Reporter: TO PREPARE, THEY HAVE BEEN TRAINING FOR TWO AND A HALF YEARS. FROM SURVIVAL TRAINING TO SKY DIVING AT THE AIR FORCE ACADEMY WHERE WE CAUGHT UP WITH THEM. WHY DO THIS? WHY DO WE NEED TO GO INTO SPACE? >> I MEAN, THERE ARE QUESTIONS THAT WE HAVE BEEN ASKING OURSELVES SINCE LIKE THE DAWN OF CIVILIZATION, RIGHT, THAT WE DON'T KNOW THE ANSWERS TO. AND THE UNIVERSE IS TO BIG. >> Reporter: AND SOMETHING ELSE THAT'S BIG. HIS FIRST MISSION RAISED A STAGGERING $260 MILLION FOR ST. JUDE CHILDREN'S HOSPITAL. >> WE RAISED MILLIONS SINCE, AND WE WILL CONTINUE TO DO SO THROUGHOUT THE DURATION OF THE POLARIS PROGRAM. >> Reporter: THIS IS A FIVE-DAY MISSION SPLASHING DOWN WE THINK IN THE ATLANTIC OCEAN ON DAY SIX. IF THEY RUN INTO TROUBLE, THEY CANNOT GO INTO THE SPACE STATION. THAT'S NOT EVEN AN OPTION. THEY ARE PRETTY MUCH ON THEIR OWN. ONE OTHER RISKY ELEMENT. THEY WILL BE TRAVELING THROUGH THE RADIATION BELT. THESE ARE HIGHLY CHARGED. THEY WILL BE WATCHING VERY CAREFULLY HOW MUC