I always wonder why I am slowing down when half way between two stars.
If its the gravity of the star that I am headed I towards I should be speeding up.
I know there is nothing else there. I have an advanced discover scanner.
It isn't the gravity of the star you less holding you back or the gravity of the star you approach that is attracting you.
The mass of the celestial bodies is affecting the ability of the FSD and therefore it works less efficiently and you slow down the greater/closer to mass that you get.