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Dara explores the Sun's darker side, starting in Houston with ex-NASA astronaut Terry Virts, who reveals its health risks. At NASA's Johnson Space Center, Dara learns how scientists track solar flares and the South Atlantic Anomaly. He examines global solar missions and ends in France at the world's largest solar furnace, where astrophysicist Dr. Orlagh Creevey explains how the Sun's immense power - and eventual death - will one day engulf Earth.