Represents a collection of terrains associated with central bodies. This collection enables adding terrain to any central bodies and not just to the current scenario's central body.
  GetItemByIndex | Retrieves a central body terrain from the collection by index. | 
  GetItemByName | Retrieves a central body terrain from the collection by name. | 
  Count | Returns the number of elements in a collection. | 
  Item | Given an index or a name of a central body, returns an element in the collection. | 
  TotalCacheSize | Total cache size (not individual terrain sources) for the analytical terrain in the scenario. Dimensionless. | 





