The move comes as the mission concept — which has been under development since 2011 — passed its first major review and progresses officially into the next mission phase, formulation. (aaas.org)
«Cassini names final mission phase its «grand finale».» (sciencedaily.com)
Spitzer begins its «Beyond» mission phase on Oct. 1, 2016... view image (spitzer.caltech.edu)