If you really want to get your mind boggling, why do you slow down to 80 when you turn off your thrusters, exit a tradelane, or leave cruise? There's no inertia in space! You'd just keep going!
Right...and wrong.
First off, "inertia" is EVERYWHERE. You got that backwards. Inertia is the energy which KEEPS an object traveling in the same direction, at the same speed, unless another force acts upon the object.
Perhaps you just meant to put a "?" at the end of that sentence instead of a "!"?
Furthermore...
A ) Ships, even the US Space Shuttle, are equiped with stabalization thrusters which are always activated to keep the ship from going were the pilot does not intend it to go.
The only way to turn these off is manually..."engine kill".
Why?
What would happen to a pilot that is knocked unconscious and has his ship traveling at top speed? He would quickly find himself far beyond any hope of any "rescue mission" being able to recover him.
Floating out of the Sirius System would be a real biatch! LMAO!
B ) Contrary to common misconception an object in space will not "travel forever". It will eventually stop.
Even the minute friction of "spacedust" is enough to bring any object to an eventual standstill...and that doesn't even take into account the many invisble magnetic fields present which would also act upon said object.
Fly well,
Pyrate Dredd