HOUSTON – The $1.1 billion joint U.S./German Stratospheric Observatory for Infrared Astronomy (Sofia), already caught in a budgetary crossfire, faces significant cost and management obstacles if Congress succeeds in forcing NASA to pursue a program of observations with the high-flying telescope that could cost $2 billion over 20 years, according to the agency’s inspector general. Sofia was declared operational in February, following a problematic 23-year, $1.1 billion joint ...


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