Deep is a synonym of Heavy. Heavy is a synonym of Massive. Massive is a synonym of Significant. Significant is related to Partner. 
Black is related to Change. Empty is a type of Change. Empty is related to Space. Space is related to Vast. 
Deep <--Synonym--> Heavy <--Synonym--> Massive <--Synonym--> Significant <--RelatedTo--> Partner 
Black <--RelatedTo--> Change <--IsA-- Empty <--RelatedTo--> Space <--RelatedTo--> Vast 