Final answer:
In a blackboard system, facts or hypotheses are stored in the blackboard component, which serves as the shared knowledge space for the artificial intelligence system.
Step-by-step explanation:
The facts or hypotheses in a blackboard system are stored in the blackboard component. In a blackboard system, which is a type of artificial intelligence system, the blackboard acts as a shared knowledge space where different components of the system, referred to as knowledge sources, can read or write information. The control component manages when and how knowledge sources interact with the blackboard, usually through a scheduler or a set of rules that dictate the system's behavior. However, it is the blackboard itself where the actual data, hypotheses, and facts are stored and made available for processing.