| 21. | People confuse relative mass with rest mass.
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| 22. | Rest mass increases according to velocity, with infinite mass at the speed of light.
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| 23. | A hypothetical particle with Complex rest mass would always travel faster than the speed of light.
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| 24. | In this case, invariant mass is positive and is referred to as the rest mass.
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| 25. | This is true in special relativity theory, even though individually photons have no rest mass.
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| 26. | This is why the invariant mass is the same as the rest mass for single particles.
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| 27. | The problem comes from thinking of rest mass as the " real " mass.
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| 28. | Anything with a zero rest mass can " only " travel at light speed.
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| 29. | Any form of energy excerts gravitational pull and has inertia, not just the rest mass.
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| 30. | :: The physics behind this is very simple-it involves the rest mass energy.
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