Charged Coupled Device
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A CCD is a charged coupled device. CCDs are quite common here on Earth. Did you know there are millions of people walking around holding CCD's? Guess where:
The CCD sensors in Hubble's Wide Field/Planetary Camera turn the light energy gathered by the telescope into a digital signal. A digital signal is a series of electronic pulses that is based on the pattern of light that fell on the electronic sensor. Once the Galaxy's light is turned into a digital signal, it is stored in one of Hubble's electronic recorders.
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