Brief is related to Moment. Moment is related to Hour. Hour is a synonym of Stroke. Stroke is related to Rub. 
Telescope is a synonym of Scope. Scope is a synonym of Orbit. you are likely to find Dust in/at/on Orbit. 
Brief <--RelatedTo--> Moment <--RelatedTo--> Hour <--Synonym--> Stroke <--RelatedTo--> Rub 
Telescope <--Synonym--> Scope <--Synonym--> Orbit <--AtLocation-- Dust 