While everybody is wondering how do we achieve light speed, a big question that came to mind is how do we travel at sub-light speeds without fuel?

In shows like Star Trek, it explains perfectly well how we get the power, (matter-antimatter reaction) and how the warp engines work, however most, if none address how the sub-light engines work.

When people talk about going light speed, they normally say that it can be achieved by bending space and time into some kind of bubble around or in front of the ship.

When you also think about it, sub-light would have to be close to the speed of light but not require the space/time bend. The purpose would mostly be docking, moving "short distances", ect.

The only way that I honestly see us doing it would be to artificially create some kind of propellant from energy. That way we could have our reactor speeding away making energy while we travel at sub-light speeds.

[Moderator: This post has characteristics similar to posts of a former user who was banned for denial of scientific expertise and substituting conspiracy hypotheses, confirmation bias and Dunning-Kruger overconfidence. Newton's three laws of motion boil down to establishing the conservation of momentum. Energy can indeed be converted into propulsion when you throw the energy away in a certain direction. The most efficient way to do this (as in throwing away the least physical substance for the same amount of thrust) is as light. Rockets are, however, technically simpler to build today for the same thrust. A Saturn V first stage generates 34 mega-Newtons of force (34 MN) and to generate this with light one would need 10 million gigawatts of light ( 10 PW ) which is only the matter equivalent of 113 grams per second. ]