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Ksp best time to decelerate12/2/2023 The duration of your journey will be a little more than the time taken for light to reach your destination and the total delta-V will slowly approach c (for acceleration) and then c more for deceleration. As you approach the speed of light, the mass of your spaceship appears to increase, and the thrust of the rocket decreases (less fuel is being used per second from this perspective because of time dilation). Similarly, when a ship in a movie turns off its engines and slows to a stop, the producers are portraying an unrealistic scenario. When I do a reentry I like to set my periapsis to about 72k, then bring my apoapsis down until it becomes 72k (where Id current be at the previous periapsis). Movies that show spaceships with their engines on all the time are unrealistic. Switch to the map view (m) to make sure your orbit is aligned with your target, and to know when to stop firing. Adding up the effect of your rocket, you will appear to have used arbitrarily much delta-V.įrom the perspective of a non-accelerating observer on the planet you started from, the same events look very different. For most of the voyage, a spacecrafts engines are off and it is coasting under its own momentum. What will appear to be happening is that by accelerating you are reducing the distance to your destination (Lorentz contraction) which is approaching you at almost the speed of light. From your perspective, doing so will shorten your journey to a distant star, which can become (again from your perspective) very short. Once relativity becomes a factor, you always have to phrase your statements so as to make it clear what point of view you are taking.įrom the perspective of the rocket, and assuming you have somehow got unlimited fuel, you can keep accelerating as long as you like.
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