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You can never reach the speed of light. If you were to travel at such speed, time around you would simply stop. Even if you were (hypothetically) travelling at 250 000 km/s (the speed of light being 300 000 km/s) and something travelled the opposite way at the same speed, you wouldn't see it travel at 500 000 km/s (which would be impossible). It's speed to you would be more something near 270 000 km/s.
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