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To answer why delves into philosophy or theology. Why is there gravity - there just is.

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The relativistic mass is the mass an object possesses because it travels at speeds that approach the speed of light ('c'). According to the Lorentz factor, the relativistic mass of an object increases as an object's speed approaches c as follows:

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mrel = m / (1 - v2/c2)1/2

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where:

  • mrel is the relativistic mass
  • m is the rest mass
  • v is the object's velocity
  • c is the speed of light

Relativistic mass is only significantly greater than rest mass for objects travelling faster than 0.1c, or one tenth the speed of light, or about 108,000,000 KPH (67,000,000 MPH). As you can see from the above equation, the denominator approaches zero as the object's velocity approaches the speed of light, making the relativistic mass unbounded.

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The Lorentz factor also applies to an object's momentum and its energy. This means not only the mass, but also an object's momentum and energy approach infinity as the object's speed approaches c. Note that, in this context, an object's rest energy is in according to the equation:

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E = mc2

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and this energy increases as the object's speed approaches c.

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