Before we get onto the main point of Yaz, we see what looks like a tower of green-lit canisters, each filled with the biological part of a Dalek. Could this be stored on the Dalek’s ships, sort of ...
Like a lot of ordinary planets, Skaro has a moon. In fact, it has three moons, two of which are natural, and one of which was constructed by the Daleks for some characteristically devious purposes.