How does KSP simulate objects out of focus?

I've attempted to perform a controlled aerobraking maneuver against Kerbin upper atmosphere (>55km) when returning from a moon and decided to speed things up with fast-forwarding from the Tracking Station. And when I had my ship circle a few rotations in the 'aerobraking' orbit, I observed that the orbit did not change, despite it should've done so.
I figure that the game does not simulate objects far from player focus properly. Is there a description what and how far from player goes out of proper simulation? A few suspected examples that I've come up with:
- Eccentric sub-atmospheric orbits
- Objects on collision course with one another (interaction/destruction/passing through)
- Science stations in orbit and on land of distant bodies (science generation/energy consumption)
My KSP is the most latest current version - 1.0.4
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Quick Answer about "How does KSP simulate objects out of focus?"
How do you change focus in KSP?
You can double click on any planet to bring it into focus, though sometimes you will accidentally switch to a ship or flag on the surface of that planet. Probably easier is to use TAB to go through everything. You can also use shift-tab but watch out. Shift is throttle up!What is terrain scatters KSP?
Terrain ScattersAdds terrain scenery like trees and rocks. Results in a fairly large performance hit when near the ground of any body.Kerbal Space Program: 25 Things To Do With Robotics
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