to finally see it go up there. at the time we were reporting the launch, i remember scientists describing this business they ve just completed is a bit like origami in space . can you explain, first of all, why can t the mirror have just gone up open? there is one very big problem, which it that the jwst has a 6.5 metre wide mirror and a rocket is about three metres wide. so, you can t fit something that big inside a tiny rocket. so they had to do some creative origami and fold it up, and put it inside this rocket. it also had this absolutely massive sun shield so this was five layers of foil, each layer is the size of a tennis court. there s no way you could fit that in a rocket, so they had to fold it all up and send it into space and unfurl it once it got there.