Hi, guys! I know a lot on how to fly the space ships in SE! Space flight is much harder than you think! To slow the space ship down when in the vacuum of space, all you have to de is to turn the space ship retrograde, fire the engine and the space ship will slow down! It is just the matter of math, orbital mechanics, space physics. Just keep practicing and practice makes perfect!! I hope this helps! Good luck!
Cheers,
Vincent