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That anticipated ability for Cygnus to remain on orbit for a full calendar year or more is a striking increase in the craft’s capability from its CRS1 contract variant to the improved versions that will fly the CRS2 contract beginning next year – with current Cygnus vehicles able to remain on orbit for about 90 days.
During this extended on-orbit lifetime, Cygnus would provide commercial and government customers the ability to perform science experiments not permissible on the ISS, demonstrate technical capabilities, mature those same capabilities, and fly a payload like SAFFIRE and downlink that data to Earth.
https://www.nasaspaceflight.com/2018/06/northrop-grumman-one-year-on-orbit-cygnus-lifetime/