For Mars<->Earth communication, consider lasers. See, e.g., en.wikipedia.org/wiki/L… .
For Mars<->Earth communication, consider lasers. See, e.g., https://en.wikipedia.org/wiki/Laser_communication_in_space .
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For Mars<->Earth communication, consider lasers. See, e.g., https://en.wikipedia.org/wiki/Laser_communication_in_space .