According to foreign media CNET, NASA’s car sized rover is an awe inspiring multi-functional robot capable of crossing rugged terrain. But they were not made to descend from the side of the crater. To do this, NASA needs something like the duaxel prototype, which combines the two rovers into one. < / P > < p > the duaxel is a four-wheel vehicle. The rear can be fixed to the ground, while the front can be moved freely with two wheels. A tether holds the parts together, while the front part descends sharply from a steep slope. This is a good way to explore the crater walls on Mars that are currently inaccessible. < / P > < p > NASA tested the duaxel prototype in the Mojave Desert, California. “Duaxel has performed very well on site, successfully demonstrating its ability to approach challenging terrain, anchor, and then unfasten its tethered Axel rover,” roboticist Issa nesnas said in a statement at NASA’s Jet Propulsion Laboratory on Tuesday. < / P > < p > one of NASA’s motivations for developing duaxel is to one day get a closer look at some mysterious dark lines on the side of Mars craters, which are called repetitive slope lines. Scientists are trying to figure out if there is a source of water. < / P > < p > these craters are too steep for probes like curiosity or willpower (currently on their way to Mars), but Rovers like duaxel can cope with this challenge. < / P > < p > it’s not just Mars Science that can benefit from this brave little Rover design. “Duaxel opens up access to more extreme terrain on planets like the moon, Mars, mercury, and possibly some ice and snow worlds, such as the moon Europa,” nesnas said Didi Qingju bicycle has entered 150 cities