Sweden Lofts X-Ray Observatory On Helium Balloon

PARIS — Sweden launched an enormous, helium-filled balloon from its Esrange Space Center on July 12, carrying the PoGOLite (Polarised Gamma-ray Observer) telescope dangling beneath it. Designed to measure polarization of soft gamma rays as it circles the globe, the 1,900-kg (4,200-lb.) PoGOLite...

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