These have already been debunked. Basically dust/debris exists outside of the portal as the thrusters fire you get changes in the speed of the ship (They aren't actually stationary when they film out the portal, they are moving. You won't see any difference to the horizon line because the Earth is pretty big compared to one little spaceship.)
Of course people automatically want to think it an Alien controlled spaceship off the starboard bow Jim!.
Lol, yep and there are people who automatically think it's dust/debris...what's your point?
Just incredible Stryder, please explain to me how space debris suddenly learned how to avoid incoming objects?