Simon has just graphed this to show how the Lorentz factor or gamma ( on the y axis) is dependent on the speed of the object (the x axis). The 100 on the x axis is the speed of light. You can see how the speed makes virtually no difference to the Lorentz factor (of relativistic time and mass) until the speed of the object reaches about 85 percent of the speed of light. At around 90 percent of the speed of light the Lorentz factor reaches 2 (which means that time is twice as slow by then and the relativistic mass doubles), and at 99 percent the factor is already 7. For 100 percent or the speed of light itself, the Lorentz factor equals infinity, Simon explained.
Geeks out of the box 