Why can light travel at the speed c?

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mibaokula said:
i just realized i misunderstood your point. i think we meant the same thing. 0/0 is indeterminate because it has an infinite number of answers - i.e. any real number. what i meant to say is that it is not enough to say the answer is 1, 0, or infinity
If you just ask the question, what is 0/0, there are an infinite number of answers, but that doesn't mean that your equation for the energy of a massless particle has an infinite number of answers, it just means that you need to determine the answer some other way.
 
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in other words, that equation doesn't fully describe light (which has no mass)
but would it describe tachyons with negative/imaginary mass (assuming they exist - which i really don't believe at the moment)?
 

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