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Watch: NASA super pressure balloon up, up and away in Wanaka


Supplied by NASA. The balloon inflates to 18.8 million cubic feet, about the size of Dunedin's Forsyth Barr Stadium. The balloon will ascend to an altitude of 33.5 kilometres where the stratospheric winds will propel it at speeds of at least 100 knots through the heating and cooling of the day-night cycle on a weeks-long journey around the Southern Hemisphere

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