In this artist's concept of a 1984 mission to Mars, a pair of Rovers (Vikings on Wheels) would follow up and extend the 1976 Martian explorations. The Rovers would gather scientific data from several wide-ranging areas and send it to the mother Orbiter for relay to Earth. Two pairs of rovers could traverse up to 5 kilometres (3 miles) daily each and help one another as needed. (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.