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Yes Alex, all coasting space vessels are slowly but surely slowed by the
collisions you mentioned. As, in this instance, the craft are being
propelled, they would maintain their speed until the propulsive force over
time and distance became less powerful than the aforementioned braking
force. I imagine that it would have been factored in. I'm guessing that
once the craft left the comparatively crowded solar system, the rate
of deceleration over such a short trip would not be significant.
raymo
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