Question: Someone told me that you need to be 'mass-less' to travel at the speed of light. So is it possible to have a negative mass making it possible to travel faster than the speed of light?

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  1. It is true that all particles the are massless travel at the speed of light. There is a hypothetical particle called a tachyon which has negative mass and travels faster than light, but there’s no evidence they actually exist.

    I don’t think it is actually possible to have negative mass. Although, given that we’ve just discovered the Higgs Boson, which is the thing that gives everything mass, who knows what we’ll be able to do in the future?