We’re back with a review of episodes 5-8 of “The Expanse,” leading up to the two-hour finale. From Earth to Ceres to the Rocinante, we’ve got our take on the misadventures of Holden and crew, Miller’s laconic interactions with Jared Harris and the rest of his space mob, and Avasarala’s snowy conversation with one of Holden’s parents. Plus, is the blue goo at the heart of the series realized effectively?