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Various reasons, most of them related to the Special Theory of Relativity.

1. To speed something up so that it even reaches the speed of light (from an initial speed that is slower than light) would require infinite energy. (However, this doesn't preclude hypothetical particles that ONLY travel faster than the speed of light.)

2. If it is were possible to travel faster than the speed of light, it would also be possible to travel to the past. This is due to the definition of "simultaneity" in the Special Theory of Relativity. If you ever read stories about time travel, you would know that time travel may result in many contradictory situations, so it seems doubtful at the least.

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13y ago

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