Some scientists have projected the energy needed to be equal to the output of the Sun. And no one knows how to make the anti-gravity field needed to protect the ship from the surrounding forces that contract and expand space. But it is still an interesting idea. A special name has been given to these particles, tardyons. These objects have positive mass.
Some particles can travel at the speed of light.
Of course photons are in this group, called luxons. These particles have no mass. If you apply all possible velocities to the special theory of relativity another class of particles emerges. These particles are called tachyons. As a tachyon loses energy, its velocity increases.