I don't that is an issue for now, because even if Elon Musk is planning into interplanetary travel and and researching if we could live in Mars. I think that it will be the least issue about our payment system in crypto industry, although crpyto transaction is in form of digital still it's impossible to be fast and reliable in the future.

You see, we have our own issues here that is left unsolved rather than executing another interplanetary transactions.