
In 1962, NASA’s Mariner 1 Venus probe was destroyed just 294 seconds after launch when an Atlas guidance antenna fault exposed a missing overbar in the rocket’s ground-guidance program
On July 22, 1962, NASA's first interplanetary probe was destroyed 293 seconds after launch when a missing overbar in hand-transcribed guidance code caused the ground computer to fly the rocket off course. Arthur C. Clarke called it the most expensive hyphen in history.















