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Five-year-old boy asks the cost of sending a letter to Mars ... and NASA gives him the answer
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Most correspondence would most likely be digitized. But I'm sure there would be a few letters and maybe some small packages. For mostly nostalgia's sake or very special occasions. That is assuming of course that: 1: We actually colonize Mars. 2: We have an active long term colony. 3: We have shipping routes between the two worlds. If all that works out and there is a shipping/courier route making regular trips between the two the cost will be lower. But that would be way off in the future.