Just to add here, remarkably you aren't first person to ever ask for Supernova, I forget how many times it has been requested over the years, and yet there are none in game and most conversations went roughly as this one has done. There's not a lot else that needs to be said really apart from this, remember that the Stellar Forge, the program that generates the galaxy and actually evolves it and all the stars and planets up to the date we are playing in game is now quite a few years old, it was cutting edge then, it is probably still pretty cutting edge even many years later, no-one else had copied what FDEV have done.
Maybe we will have an entirely new game based on a new engine and galaxy simulation in the future and I suspect that's the only chance of actually getting a Supernova evert on an Elite game.