Without a degree of scepticism, the actually interim certainty of gravity would have been thought of as final certainty. Scepticism is about contextualising the findings of the research programme, so as not to delude ourselves, thinking that what we have learned cannot be refined any further, conflating interim certainty with final certainty. Treating scepticism as a kind of certitude, as interim certainty, is an epistemological way of understanding exactly what a sceptic’s position is.