REUTERS — National Aeronautics and Space Administration (NASA) celebrated a historical milestone on Wednesday (July 20): the 40th anniversary of the first U.S. spacecraft to land on Mars. On July 20, 1976, NASA successfully reached the Martian surface with their Viking Lander 1. The Viking project – comprised of two separate spacecraft – together took more than 65,000 images of the planet and collected overwhelming amounts of data. The primary goal of the Viking mission […]