But then: reducing mass doesn't actually make FTL possible. Thus, as an explanation for FTL, that element fails. The thing is, you needn't explain such things in an SF story, some fantastic elements work just fine unexplained as long as they don't become a topic in the story (which ftl travel never did, it was just a means to get to places), but *if* you're going to supply an explanation, it should make sense, hold up to *some* scrutiny using in-world logic and not collapse the moment when players start thinking about it.
Well, this sort of thing has a long SF pedigree. I think the mass effect drive is blatantly lifted from the Lensman series; although "Doc" Smith was enough of a scientist to know better, and actually lampshades that physics says the drive couldn't work before establishing that it does work.
Well, in order to pull things towards it, it has to have a gravity that is significant compared to the gravity of the planet, and the local mass effect would have to exceed the planet's, which means that creating a singularity is gravitationally indistinguishable from placing another planet close by for the duration of the effect, and then withdrawing it.
But wouldn't that mass only exist within the boundaries of the mass effect field?





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