# Effects of travel greater than speed of light [closed]

What will happen if a person with say weight of 100 kilograms, starts to travel with,

a) equal to speed of light?

b) greater than speed of light?

## closed as off-topic by garyp, ACuriousMind♦, Neuneck, David Z♦Nov 10 '14 at 13:56

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "We deal with mainstream physics here. Questions about the general correctness of unpublished personal theories are off topic, although specific questions evaluating new theories in the context of established science are usually allowed. For more information, see Is non mainstream physics appropriate for this site?." – garyp, ACuriousMind, Neuneck, David Z
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• the problem with this question is that there is no real way to get up to that speed for the matter with rest mass. As you approach the speed of light you actually are traveling through time, and there is a fundamental limit to how quick an outside observer can see you going This outside observer is the only person who can actually tell you how fast you are going because in relativity there is no absolute reference frame. – Skyler Nov 10 '14 at 10:38
• It's an okay, but somewhat misguided question, but I'd suggest you pull it down before half the community bullies this question down. – Skyler Nov 10 '14 at 10:42
• See also the recent question physics.stackexchange.com/q/143615/8851 – b_jonas Nov 10 '14 at 10:45
• – Nikos M. Nov 10 '14 at 11:03
• @Skyler, one should not accept bullying (nor accept its subtle variation of a bad but given unavoidable reality). And if this is an ok question (as your comment hints) i would expect to stand up to it, instead of using these kinds of subtle variations (which the comment is assumed to disagree) – Nikos M. Nov 11 '14 at 17:53

The energy required to accelerate a massive object from below the speed of light to the speed of light (or beyond it) would be infinite, so it's not thought to be possible at all. This can be derived from the fact that the momentum $p$ of an object with nonzero rest mass $m$ and velocity $v$ is given by $p = mv / \sqrt{1 - v^2/c^2}$, which approaches infinity as $v$ approaches the speed of light $c$, and the total energy of an object, including both the energy due to rest mass and the kinetic energy, is given by $E^2 = m^2 c^4 + p^2 c^2$.