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What connection do Mars rovers use to send data to Earth?
5 votes

Generally what happens is that radio signals are sent from the Martian surface to a spacecraft orbiting Mars, which then sends the data to Earth. As an example, the current NASA missions on the ...

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What image compression algorithm did the Voyagers use?
3 votes

I tried to look for a publicly accessible link to the Urban (1987) paper that was referenced in @Organic Marble's answer. Fortunately, it is publicly accessible through the University of Arizona: ...

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