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NASA will delay the launch of its ambitious James Webb Space Telescope (JWST) by nearly a year, until approximately May 2020. That is likely to push the cost of the mission — the most complex space-science telescope ever built — over the US$8-billion limit set by the US Congress. It is the first major setback since NASA revised its plans for the project in 2011, after years of slipping schedules and rising costs. NASA announced the delay on 27