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... theory, let alone the speed of light. When light accelerates to one-fifth of the speed of light, it will face obstacles invisible to the naked eye: such as the annihilation of positive and negative particles, vacuum fluctuations, etc... and all kinds of objects floating in the universe. A variety of large and small particles.

And if the spacecraft wants to fly, it needs to carry a lot of fuel.

But the more fuel, the heavier the quality, the greater the driving force required, and ...

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