Nerhesi said:
I'd be wary in attempting to define scifi (forget even hardness) with what is realistic today.
It's not about that. I don't know why people are having such a hard time understanding this. Collectors rely on something that
doesn't exist. Not that can't be detected - it just does not exist. It is pure fantasy. There is no science in there whatsoever.
Grav drives? Gravity exists, and it's not unreasonable to believe that it could be manipulated at some point. Jump drives? Wormholes are theorised to be possible, it's not unreasonable to believe that we could find a way to make them (with 'jumpspace' being the transit through the wormhole). Superdense armour? superdense materials exist, maybe we can find a way to collapse matter into such a state and manipulate it. These are properly "science fiction" - there's a little science in there even if it's mostly fiction.
But Collectors? There's no basis for them at all, as described. We know the particles that stars emit, we know they decrease with distance from the star, we know that stars have different luminosities. Collectors ignore all that and magically collect enough of whatever it is at the same rate, regardless of their location. As described, that is utterly impossible.
Note that I keep saying "as described". If Collectors are a thing, then fine, but they just need a better explanation that agrees with how they're supposed to work. So:
1) If we allow that they are collecting some kind of magic particle from stars, then the rate at which they do so
must depend on the luminosity of the star and on the distance that they are from the star. That's just basic physics right there, and cannot be ignored.
2) Alternatively, maybe they don't collect anything at all. Perhaps they just tap into 'zero point energy' or the quantum foam or something like that (again these are known to exist. Right now it's fantasy to say that they can be tapped for any energy, but one could imagine that by TL14 maybe someone's figured out a way). This wouldn't depend on distance from stars, it just requires that the ship exists in spacetime (and maybe it requires undisturbed spacetime so it can only be done away from large masses like planets).
Either of those options would address this issue.