Still vaguely working on Starstuff, the nebulous scifi YA novel I may someday write.  Its rough drafts are much, much rougher than my usual, which tells me that this narrator really isn't done cooking yet, but I wrote something today that might be of interest:  the tech used in this universe for long-distance spacetravel.  For sublight, there's a diametric drive, and for FTL, there's a wormhole-creating machine.

My grasp of astrophysics and theoretical physics is very weak.  So I am not at all sure that I am describing these concepts correctly, and I am certainly not sure if my attempt to give a practical, Bill-Nye-ish explanation to young readers is at all comprehensible.

So if you are an astronomy or physics nerd, and this sort of thing interests you, please, read what i've got here and
( Fact-check me, Amadeus: )