Reply to post: "16.999 km/s (in Standard International units)"

Voyager 1 fires thrusters last used in 1980 – and they worked!

John Smith 19 Gold badge
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"16.999 km/s (in Standard International units)"

That's about Mach 49 (for reference Earth orbital velocity is about M23).

OTOH that's 0.0056% of the speed of light.

However in principal systems can be engineered (no breakthroughs in physics, including fusion, needed) that could get to 5% of the speed of light.

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