Why do so many people think that the partially destroyed moon is Praxis? Was it mentioned in STID? Did they say in TUC where Praxis was in relation to Kronos? Wouldn't an explosion like the one that opened TUC likely have destroyed Kronos in TUC if it was an orbiting moon?
The fact that it looks exactly like Praxis, is a moon of Kronos just like Praxis, and that the writers of this movie have packed the last two entires with references to old Trek is a damn good indication.