Earth, mars and the moon have custom entities that override their appearance. This can be done by pre-scripting a system and can be modified by messing around with the save files. However I was wondering whether there is a command that allows you to easily change entities in game (preferably through an event)? Planet class, for example, can be easily changed with the console 'planet_class' command or in events with 'change_pc'. Is there an entity equivalent?