NASA's Mariner 2 Spacecraft Achieves First Deep Space Maneuver En Route to Venus
On September 4, 1962, NASA's Mariner 2 spacecraft successfully executed the first-ever rocket maneuver in deep space. This mid-course correction was crucial for adjusting its trajectory towards Venus, just eight days after its launch. The maneuver involved five distinct commands from mission control, instructing the spacecraft to roll, pitch, turn, and fire its engine. This precise adjustment was necessary because the Atlas-Agena rocket that launched Mariner 2 did not achieve the required accuracy for a direct course to Venus. Without this correction, Mariner 2 would have missed Venus by a significant margin, passing within 238,600 miles (384,000 kilometers) of the planet's center. The successful burn, which lasted approximately 36 minutes, set Mariner 2 on a path for a much closer flyby of 21,607 miles (34,773 km). One hundred days later, Mariner 2 became the first spacecraft to successfully fly by another planet. 
