Environment is a type of Situation. Citizenship is a type of Situation. 
Shuttle is related to Space. Space can be Huge. Huge is a synonym of Great. Great is the opposite of Awful. 
Environment --IsA--> Situation <--IsA-- Citizenship 
Shuttle <--RelatedTo--> Space --HasProperty--> Huge <--Synonym--> Great <--Antonym--> Awful 