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The Question

(Submitted May 12, 1998)

Why is it not possible to travel at the speed of light?

The Answer

According to Special Relativity the total energy of an object increases as its speed increases and approaches infinity as the object's speed approaches the speed of light. This means that it would take an infinite amount of energy to accelerate an object to the speed of light.

Damian Audley
for Ask an Astrophysicist

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