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Out of curiosity, what is the relationship between 430,000 mph and the speed of impulse power on Star Trek? I assume Parker Solar Probe is way slower, but what are we talking?

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Apparently, full impulse is relative to the engine spec. For the Voyager, it is 0.25c, so about 167 million mph.

Edit: https://memory-alpha.fandom.com/wiki/Impulse_engine

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