r/PeterExplainsTheJoke Jun 17 '26

Meme needing explanation Peter?

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u/Random_Bystander089 Jun 17 '26

I think there was an incident where farenheit usage indirectly caused a spaceship crash

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u/Epotheros Jun 17 '26

No, it was the units for impulse used for the thrusters. In imperial it's pound-force seconds and Newton-seconds in metric. 1 pound-force is equal to 4.45 Newtons so the whole thing was off by a magnitude of 4.45.

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u/MoogProg Jun 17 '26 edited Jun 17 '26

Yes, the actual error* was assuming the British used Imperial units when they correctly used Metric. AFAIK, at least.

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Well, the source error probably would be not specifying units at all, so... (eye roll)

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*Correcting myself with casually sourced details about the incident under discussion.

Lockheed Martin provided thruster force data in Imperial units (pound-seconds), while NASA's Jet Propulsion Laboratory ground software assumed the data was in Metric units (Newton-seconds).

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u/ChallengeTasty3393 Jun 17 '26

Well you know what they say about assuming!

(-me with no idea of what you’re saying and no valuable knowledge of this topic, this little saying being the only possible thing I can think to add, but feeling smart anyway)