Why We Cannot Travel Faster Than Light
Light is pure radiation, the substance of raw energy. It has no mass (inertia) although we can see some “mass-like” properties in it.
Matter is a semi-condensed state of radiation. It has mass. It must, since if we move it, it must resist putting any of its internal radiant components past the speed of light. We can readily transfer radiant energy back and forth to and from matter. As you accelerate matter toward the speed of light the matter is being induced to convert itself back into light (in order to be moving at that speed). Near the speed of light matter begins to radiate (attempting to get to its radiant state). It is however being pushed through to its radiative state through a path it has a difficult time traversing. It’s comparable to isostatically pressing on a diamond in an attempt to break it apart. We can efficiently convert matter into 100% radiation by combining it with anti-matter. But here we see the limit; the matter is now in its radiant state moving at the speed of light. It has no mass so it cannot be accelerated further.
In other words, for matter to get to the speed of light it must be transformed back into uncondensed radiation.