There is a Sci-Fi genre called space opera. The time is set in a space age ... and people live in the outer space.

Sometimes I fancifully wonder in what language those people speak. What language the most likely do they use?

How I've thought personally of this was like this:

Can a large population live in the outer space, in the first place? The technology level that is required for people to live in the outer space would be hyper demanding. It would be far more difficult than to live in the deep underground or at the bottom of the sea, building towns or cities there. Even living in such places is very dangerous and the required technology level seems far beyond that which humans have achieved today. Therefore, it seems that people with super IQ or super intelligent AI or something of the sort must be needed to realize the "space age." In such a level of civilization, probably the lagnguage used there could well be quite different from our contemporary ones. So, when you imaginatively ask "What language will be dominant in the future space era?" it might, seemingly, find no options among languages we know, which are languages that we are using today.

But the humanity today uses computers and jets and rockets etc., which would seem being at some incredible level of technology to, say, Ancient Romans' eyes. But it's not the case that we today are using a language essentially more complex than Latin. Therefore, even when there comes the space age, the language people then use might be within the reach of our understanding.

Ah, is either of the conjectures of mine be right...? Or are the both of them wrong...?

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But perhaps what's wrong with my conjecture about this might be about the premise. The far future can easily utterly be beyond imagination. From old-time magazines or newspapers left, we know that the early 20th century people could not imagine correctly enough how technology would evolve and change the world 100 years later. Probably almost none of them living in the early 20th century could rightly infer what technologically different way of life would be brought about 100 years later. So, the most likely "space age," if there is to be such one to come in the far future, is the most different from today's novels or movie mainstream imaginations?