Page "Galileo (spacecraft)" Paragraph 55
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The Cassegrain telescope of the UVS had a 250 mm aperture and collected light from the observation target.
This light then passed through an exit slit into photomultiplier tubes that produced pulses or " sprays " of electrons.
These electron pulses were counted, and these count numbers constituted the data that were sent to Earth.
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1.811 seconds.