~ yet undiscovered that could travel much much faster than the speed of light
As we currently understand physics, nothing with physical mass can be accelerated to light speed due to the need for (theoretically) infinite power to achieve that velocity. Essentially, whatever engine that could supply the necessary power would be too massive to push that fast.
Light photons uniquely overcome this limitation by having no mass. Is there anything else we know of in the universe that has no mass and moves from one point to another?
Food for discussion