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CCD (charge-coupled device) is an extremely efficient solid state detector that facilitates the collection and processing of astronomical images.

A CCD is a network of photodiodes (electrical circuits sensitive to electromagnetic radiation). The CCD records the location of each photodiode on which an X-ray photon strikes (a photon is a packet of electromagnetic radiation). It also records the energy of the photon, which depends on its frequency, and therefore on its wavelength.

Currently, digital cameras capture images thanks to a CCD.

CCD sensors are photosensitive electronic devices. They have a structure of light-sensitive cells in the form of a mosaic, each of these cells is what is called pixel. Each pixel is a detector structure that is capable of storing photons.

Each pixel has dimensions of the order of about ten times a thousandth of a millimeter. This small structure not only stores the photons in the form of an electric charge, but also has a structure capable of transferring the collected photons (in the form of electric charges) to an adjacent pixel.

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