SpaceX Polaris Dawn launch pushed back after helium leak

Tshwane mayor Cilliers Brink.
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SpaceX pushed back the historic launch of an all-civilian crew on an orbital expedition set to mark a new chapter in space exploration with the first spacewalk by private citizens.
The Polaris Dawn mission, organized by billionaire entrepreneur Jared Isaacman, was set to lift off early Tuesday from NASA’s Kennedy Space Center, but is now targeting early Wednesday after a late technical hitch. 
“Teams are taking a closer look at a ground-side helium leak on the Quick Disconnect umbilical,” Elon Musk’s company wrote on X. Umbilicals connect a tower with a rocket, while helium is a non-flammable gas often used to pressurize fuel lines. 
Riding atop a Falcon 9 rocket, the SpaceX Dragon capsule is set to reach a peak altitude of 1,400 kilometres — higher than any crewed mission in over half a century, since the Apollo era.
Mission commander Isaacman will guide his four-member team through the mission’s centerpiece: the first-ever commercial spacewalk, equipped with sleek, newly developed SpaceX extravehicular activity (EVA) suits.
Rounding out the team are mission pilot Scott Poteet, a retired US Air Force Lieutenant Colonel; mission specialist Sarah Gillis, a lead space operations engineer at SpaceX; and mission specialist and medical officer Anna Menon, also a lead space operations engineer at SpaceX.
The quartet underwent more than two years of training in preparation for the landmark mission, logging hundreds of hours on simulators as well as skydiving, centrifuge training, scuba diving, and summiting an Ecuadoran volcano.
Polaris Dawn is set to be the first of three missions under the Polaris program, a collaboration between Isaacman, the founder of tech company Shift4 Payments, and SpaceX. 
“The idea is to develop (and) test new technology and operations in furtherance of SpaceX’s bold vision to enable humankind to journey among the stars,” Isaacman said during a recent press conference. 
Isaacman declined to reveal his total investment in the project, though reports suggest he paid around $200-million for the SpaceX Inspiration4 mission in September 2021, the first all-civilian orbital mission.
Polaris Dawn will reach its highest altitude on its first day, venturing briefly into the Van Allen radiation belt, a region teeming with high-energy charged particles that can pose health risks to humans over extended periods.
The crew will orbit nearly three times higher than the International Space Station, yet will remain far short of the record-breaking distance of over 248,000 miles set by the Apollo 13 crew in 1970.
Apollo 13’s astronauts journeyed that far to slingshot around the far side of the Moon after an explosion crippled their spacecraft, aborting their planned lunar landing and necessitating a return to Earth without major propulsive maneuvers.