Answer: Lunokhod 1
While America beat the Soviet Union in bid to put a man on the moon, the Soviets soundly beat the Americans in the race to put a Rover on a celestial body. On November 10, 1970, Lunokhod 1 was married to the moon aboard the Luna 17 spacecraft; The launch followed in the footsteps of the failed Lunokhod 0 launch in 1969.
Lunokohd 1 was successfully deployed on the moon seven days later and spent the next 11 months sending reports — including soil sample analysis and photographs — back to earth. The rover relied on a solar cell array to operate during the day and when the sun set on the moon, plunging the temperatures to a very brisk -300F, the little rover kept from freezing solid thanks to a radioactive heater unit powered by polonium-210 . Lunokhod 1 held the record for longest functional space rover for over 30 years until it was dethroned by the lengthy service records of the Mars Exploration Rover Mission rovers, Spirit and Opportunity.
When America finally put a rover on the moon, it was part of the later Apollo missions and served as a lunar vehicle for the astronauts to navigate the moonscape. Thanks to high resolution images from NASA's Lunar Reconnaissance Orbiter, it is possible to check out the final resting places of several man-made objects on the moon including the Lunokhod 1 rover, the Apollo rovers, and various moon landers from both Soviet and American lunar missions . The Apache Point Observatory Lunar Laser-Ranging Operation (APOLLO) from the University of California at San Diego uses the rover as a laser reflector after, much to their surprise, they found the reflected laser light better than the purpose-built reflectors placed on the moon.