NASA's Mars Climate Orbiter was lost because engineering teams used different measuring units
the verdict
SUPPORTED
the evidence backs this
confidence 75/100
NASA's Mars Climate Orbiter was destroyed because Lockheed Martin used English units (pounds) while the navigation team expected metric units (newtons), resulting in fatal trajectory errors.
Evidence for · 3
Wikipedia: Mars Climate Orbiter
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Reference article covering this claim directly
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More for · 2
science.nasa.gov: Mars Climate Orbiter - NASA Science
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Notes the orbiter failed due to a navigation error caused by failing to translate English units to metric.
science.org: A System Fails at Mars, a Spacecraft Is Lost | Science
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Confirms the root cause was the misuse of English units instead of metric-seconds for thruster data.