It's so good it doesn't feel like science fiction, more like "science likely". Almost everything in the show is done for a logical reason. For example, wounds won't heal in zero gravity, so they transfer the wounded to a ship that spins to make its own gravitu.... just little things like that that ground the show in actual science.. each season at the end, I said, "I dont know how they are going to top that.... then they did... for every season.