Event Brief
Jun 21, 2026 at 12:00 PM ET
Mars Climate Orbiter destroyed by imperial/metric mix-up
By The BriefBrief
NASA’s Mars Climate Orbiter was torn apart after a units mix-up between imperial pounds and metric newtons.
WHO: NASA
WHAT: Mars Climate Orbiter was torn apart in Mars’s atmosphere due to an imperial-versus-metric units mix-up.
WHEN: Jun 21, 2026 at 11:55 AM ET
WHERE: Mars atmosphere
WHY: Software used imperial pound-force values that navigation software treated as metric newtons, pulling the spacecraft off course.
Reporting from 1 identified publisher for this event.
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