Space probes send information and pictures back to Earth using the Deep Space Network (DSN), a collection of big radio antennas. The antennas also receive details about where the spacecraft are and how they are doing. Whereas, an analog device transmits through electromagnetic waves and electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space. The natural space radiation environment can damage electronic devices so an analog device cannot be used.
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But they would be able to use analog devices in the future, if they create suitable protection for it.