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Continue to ChatDARPA’s Balloons Could Hover at the Edge of Space Indefinitely https://amazingstories.com/2018/11/darpas-balloons-could-hover-at-the-edge-of-space-indefinitely/
DARPA’s Balloons Could Hover at the Edge of Space Indefinitely https://amazingstories.com/2018/11/darpas-balloons-could-hover-at-the-edge-of-space-indefinitely/