On July 20, 1976, exactly seven years after humans first walked on the Moon, NASA pulled off another first. A spacecraft called Viking 1 settled gently down onto the rust-colored plains of Mars, a place named Chryse Planitia, and became the first lander to successfully touch down on Mars and beam back working pictures. Engineers in mission control held their breath for nearly 20 minutes - that's how long radio signals took to travel from Mars to Earth - and then the first photo arrived, showing rocks, dirt, and the alien Martian horizon.
Viking 1 had launched 11 months earlier from Florida and traveled 460 million miles across the solar system. The lander was the size of a small car, while the orbiter that delivered it kept circling Mars overhead, taking photos and acting as a radio relay. The lander had a robotic arm that scooped up Martian soil, dropped it into tiny ovens, and tested it for signs of life. Scientists are still arguing about the results today - some of the tests showed weird chemistry that could be life, or could be just unusual Martian dirt.
Viking 1 was supposed to operate for 90 days. It kept going for over six years, sending back more than 57,000 photos and weather reports of dust storms and freezing temperatures that drop to minus 178 degrees Fahrenheit. The mission proved that humans could land safely on another planet and study it up close, opening the door for every Mars rover and lander that followed. Today, when Perseverance trundles across Mars searching for signs of ancient life, it stands on the shoulders of Viking's red-dirt landing.
