There is probably no issue more vexing to sci-fi authors that FTL travel. That is, to the extent we care about the ‘sci’ and not just the ‘fi’. After all, talking-head aliens who speak perfect English might be unlikely, but they don’t contravene any fundamental laws of physics. FTL travel does.
So do we have resign ourselves to a future trapped with a senile star that’s going to bake our planet to the ‘cooked-through’ stage in maybe a little as 100 million years (give or take, and depending on which model of stellar evolution you believe in)?
Well . . . maybe.