Philosophical argumentation often depends on modal facts, i.e. facts about what is possible, contingent, or necessary. For thought and cognition outside the domain of philosophy modal facts are also often decisive. It seems we have an easy access to modal facts, but how so? Through a presentation of the state-of-the-art in modal epistemology I wish to outline a research project based on conceivability that will try to explain how we come to know modal facts.