Known facts are pieces of information that have been verified and widely accepted as true. However, there are various alternative phrases that can be used to describe this concept. For example, you could use the term 'established truths' to convey a similar meaning. Similarly, 'undeniable evidence' suggests that the facts are beyond dispute. 'Common knowledge' emphasizes that the information is widely understood and accepted. 'Certainties' suggests that the facts are completely secure and reliable. Overall, there are many ways to describe known facts, and the choice of words can depend on the context and tone of the conversation.