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> A human could easily travel billions of light years in a single lifetime.

Serious questions follow. How and using what technology? Why are we still struggling to go to the moon or Mars by taking weeks or months?

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Accelerating 1g constantly is much more difficult than it sounds. You'd need a practically infinite fuel source or some way to generate fuel while traveling. That's why the EM-drive was so tantalizing. If we could [near] perpetually generate even the smallest amount of thrust, the implications would be unimaginable. But for now this seems impossible.

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