In this undated artist rendition released by NASA/JPL-Caltech showing NASA‘s Mars Science Laboratory Curiosity rover, a new report says significant challenges remain before NASA can launch its next rover to Mars later this year. The report by the space agency’s inspector general released Wednesday June 8,2011, found that although mission managers have worked through problems that caused the two-year launch delay, hurdles remain.

First published in the June 30, 2011, 9:07 a.m. edition

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