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Walter Carlos asked How did old space probes relay photos back to earth?
Back in 1977 when Voyager 1 was launched, digital cameras were merely an experimental technology. Does Voyager have a film camera? Do cameras operate unaided in the cold open space temperatures? And how did it convert celluloid images into transmittable data that was relayed back to earth for all of us to see, like the beautiful images of Saturn?
And got the following answer:
The some spacecraft, like the early weather satellites, didn't really use camera technology at all. They had a light sensor that was fixed to the spacecraft, and scanned because the craft was rotating, so as it flew along it got different scan lines. Then, other spacecraft used picture tubes (vidicons) which would capture an image and then read it out with an electron beam, and then the image would be transmitted back to earth. No film was used -- it was the vidicon images.