Juno Overview (NASA)
"Juno will improve our understanding of the solar system's beginnings by revealing the origin and evolution of Jupiter."
Viking 1 & 2 (NASA)
"NASA's Viking Project found a place in history when it became the first U.S. mission to land a spacecraft safely on the surface of Mars and return images of the surface. Two identical spacecraft, each consisting of a lander and an orbiter, were built. Each orbiter-lander pair flew together and entered Mars orbit; the landers then separated and descended to the planet's surface."