What is a charge-coupled device (CCD) ?
A) a very fine grained photographic film that can be "read" electronically
B) an extremely sensitive thermocouple that records the temperature increase every time a photon hits it
C) a spectrometer that has been made especially sensitive by using a grating with over one million lines per centimeter
D) an array of electronic sensors that record the charge buildup due to photon absorption
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