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this post was submitted on 13 Nov 2023
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Did you mean L5? L3 is always in line with the sun, so it doesn't seem like it would be useful for communication.
Would it be easier to have a separate satellite for each direction, one at the Earth-Sun L4 point, and one at the Mars-Sun L4 point? Could we get a large enough dish to the Earth-Sun L4 point?
Alternatively, could we use lasers instead of radio? The SpaceX Starlink satellites have laser inter-links, and NASA just sent up the ILLUMA-T payload to the ISS last week.