
In 1962, NASA’s Mariner 1 Venus probe veered off course and was destroyed 294.5 seconds after launch after a guidance-antenna failure and an omitted overbar disrupted its guidance system
On July 22, 1962, NASA's first Venus probe was destroyed 293 seconds after launch when a missing hyphen in its guidance code sent the Atlas rocket off course. Arthur C. Clarke called it the most expensive hyphen in history — and the fix flew five weeks later on Mariner 2.














