The inner workings of Euclid. The optical bench of the European space telescope has a complex structure. From this angle, the light (white arrow) enters the telescope from below and is deflected by several mirrors onto a special component called a dichroic filter. This component separates the visible light (orange arrow) from the near-infrared light (red arrow). The visible light is reflected and directed to the Visible Light Instrument (VIS, top), while the near-infrared light passes through the instrument to the Near-Infrared Spectrometer and Photometer (NISP, right).