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Lunar rover

Vehicle that travels on the Moon's surface

  • 10 min read
  • 7 chapters
Position of landing sites of all rovers and sample return missions superimposed on Clementine UVVIS 'False Color' or Color-Ratio Image data using a Winkel Tripel projection. red: lunar highlands, most
Zamonin · CC BY-SA 3.0

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Variations in design

Lunar rover designs have varied in several ways.

Size and speed

Lunokhod rovers were 170 centimetres (67 in) in length. The LRVs were 10 ft (3.0 m) long with a 7.5 ft (2.3 m) wheelbase, and achieved a top speed of 11.2 miles per hour (18.0 km/h) during Apollo 17.

Power

The Lunokhod rovers, and others, used photovoltaic solar power. The LRV rovers were battery powered. Lunokhod and the Chinese Yutu rovers were furthermore equipped with a radioisotope heater unit to keep instruments warm. These, however, delivered only heat, not electric power. While unlike on other celestial bodies, such as Earth or Mars, there is no atmosphere to interfere with solar power, the extreme length of the day/night cycle complicates the use of solar power as energy storage or hibernation are necessary for any missions exceeding two weeks in length. There are places where solar power is almost always available (especially near the lunar south pole) on the Moon, but to date no mission has successfully landed a rover at one of those places. Radioisotope thermoelectric generators can operate independent of the day/night cycle and have been used on missions to other celestial bodies in the past.

Propulsion

The LRV was a four-wheel design. The Lunokhod rovers used eight.

Thermal control

To remain warm during periods of lunar night the Lunokhod rovers used heat from radioactive polonium-210.

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