Electroglyph; If you take the reaction-time of your eyes into the equation, the whole object flying by at light-speed would be invisible to the human eye. So that means the object would have no visible shadow too. So an object moving faster then the speed of light should also be invisible. I think you've got the right answer to the question. Bikermouse; I've once been told that if an object collides with another object at the speed of light it would just fly through without a collision. If this is true then the object flying at light speed should also fly through the higgs-field without colliding with the higgs bosons and thus have no mass. But at that point the infinite amount of energy needed to get the object to the speed of light in the first place will not be kinetic energy anymore, because the object hass no mass. Where does that energy go? How does that work with the equation you explained? The equation assumes the object has mass. But now it hasn't. Where does the kinetic energy go? It can't just disappear can it?

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