Neat! Keeping the commet on screen with some camera work or having an indicator with some details about it (like an arrow pointing to it or something along those lines) would help polish it up. Do each of the planets contribute to the gravity? I wasn't clear if they had an impact or if there was a central point that the calculations were based on.
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Thanks for the feedback. There is a compass indicator that pops up when your ship goes too far from the center, I might need to shorten the distance at which it shows up. All of the planets contribute individually to the gravity field, but it's more noticeable when you are at a low velocity inside the solar system.