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I think it is all relative. The light from the headlights would catch up to your craft because the light would travel at the speed of light relative to your speed.
The rifle I have a little trouble with, because the projectile is travelling much slower than the speed of light the bullet would leave the end of the barrel (speed of light + 4500f/s, relative 4500f/s) but as the projectile slows (would it?) the aliens would be in danger of shooting themselves as they overtake the projectile.
Forgive the ramblings of a sick man (bloody flu)
Adrian
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