First off, in order to travel at the speed of light one needs to meet time dilation head on! In other words, in order to traverse space from point a to b within a three dimensional XYZ coordinate system with a time constraint such as light speed certain aspects of the ship and environment need to be overcome. A super light Hull that is malleable along with nth degree tensor strength of its alloys are a priority. I have calculated the energy required via H2O to obtain a gravity assisted displacement field for a 4.44 billion kilograms spaceship to travel up to 1 light year is about 6.173 ounces of water. A special form of Hyper Physics is necessary in utilizing a electron & anion antimatter collider that uses a containment field which does not allow core collapse melt downs at the risk of detonating the universe. The energies to realize this feat are extremely risky, however if there is a 99.9999999999999999999999% safety feature in known physics for distorting space with a field displacement; which agrees with certain gains in time dilation to overcome physics boundaries that procures travel up to 1 light year at light speed using 6.173 ounces of water then its worth it. The overall energy output for 1 full light year by using an onboard electron & anion antimatter collider that uses a safe containment field that allows for producing the stasis warp dynamics of space distortion is equal to 122109008038130000000000000000000000000000000000000000000 eV.
An exponential equation with time using snippets of the total energy along the way at light speed would be able to bifurcate the full 2.9526E+70 Hz giving to the stasis warp dynamics of the space distortion field.
The theoretical ship I'm discussing is:
Well the said Vader's Super-
Star Destroyer ended up bankrupting an entire system, so to work backwards, and keep in mind there are different size Star Destroyers, but if you mean the general big ones, I'd say they would be the equivalent of bankrupting a small country.
Scale invariance, a feature of objects or laws that do not change if length scales (or energy scales) are multiplied by a common factor. Every dilation of a Euclidean space that is not a congruence has a unique fixed point that is called the center of dilation. Some congruences have fixed points and others do not. https://en.wikipedia.org/wiki/Dilation_(metric_space)