“The transformable lunar robot will be an ultra-compact and ultra-lightweight robot that can traverse in the harsh lunar environment,” JAXA stated. The robot’s diminutive size and small mass of 250 grams, JAXA added, “contributes to a reduction in volume during transportation to the moon. Therefore, it is expected to play active roles in future lunar exploration missions as well.”

Source: Japan will send a transforming robot ball to the moon to test lunar rover tech | Space