ART-XC telescope. Upper left panel: face-on view of the seven MSs looking towards the detectors. Lower left panel: side view of the detector block prior to assembly; there are seven detectors located in the detector block that align with the seven MSs. Above the detector block, in the direction toward the MSs, are collimators for each detector each with a calibration source block. Right panel: complete telescope housing all seven MSs (far left in the image) and the detector block (near right) and associated hardware, including elements of the thermal control system: radiator and heat pipes. The electronic blocks in the foreground are to be mounted on a thermally stabilised platform for flight (not shown). The star tracker is located at the MS end of the carbon and copper telescope tube (hidden from view in this image).