Playing devil's advocate: Perhaps universe as in "look up, it's the stars"? I think it's plausible, many children in that age also know about astronauts and aliens already.
In Germany we also have "das geht mir am Arsch vorbei", which translates to "that goes across my ass". It's the more vulgar version of "ist mir wurst" or "it's sausage to me"
I think the first one leaves open what you do, as alternate actions lead to an alternate timeline. The second is more "read-only", similar to what OP laid out.
Git default branch renamed back from main to master