Test mirror module produced for the ESA’s silicon pore optics research project. Mirror plates are stacked up then two sets of stacks are co-aligned together to form a module in flight configuration. Hundreds of such modules would then be put together in order to form a ‘petal’. A total of eight carefully-shaped petals would serve to form the X-ray optics of the IXO candidate mission. An international consortium coordinated by cosine Research has so far demonstrated every step in the chain up to module assembly, with completed modules being put to the test in X-ray facilities.