>

But we are talking about mediums for languages that you can use in the Vacuum of Space so your point is moot.
P.S.
Radio waves can propagate through Vacuum which is why it was mentioned as an example.
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Morse code. Semaphore. International maritime flags. Literally anything displayed on a screen or written on paper. >

If you're gonna use a medium, then all languages work. Radios, paper ect. >

Are your hands not a medium for sign language
You could write on your hands >

And air a medium for voice >

There's no air in the Vacuum of space >


if you’re gonna use a medium  

That’s my point, if you change it to allow mediums like the top level comment said anything could work including voice through air