What's got six wheels and operates in very low gravity?
The answer: NASA's new lunar rover, informally called the "Chariot," which is currently being tested in two different configurations in the Arizona desert.
The rover basically looks like a big metal spider on wheels, and can be driven as such by a spacesuit-wearing astronaut.
Add a pressurized cabin, and it's a high-tech self-propelled Airstream trailer, with beds, a kitchen and a toilet.
The next step: to take the battery-powered vehicle out for a three-day spin by itself, without any support.
The rover is part of NASA's Constellation program, which aims to get astronauts back on the moon, permanently, by around 2020.