The Mars Climate Orbiter mixed up feet with meters. Seems it calculated how far off the surface it was during landing, and when it decided it was at 0 units abo

The Mars Climate Orbiter mixed up feet with meters. Seems it calculated how far off the surface it was during landing, and when it decided it was at 0 units above the surface the retro-rockets were shut off as intended. Except that it was, in fact, still a few miles up. Code re-use struck again.