In November, Scarab proved it could handle the task. The five-foot-long rover climbed 28-degree slopes, drilled on an incline, ventured solo in the dark for hours, and avoided obstacles. The team also tested an "inchworm" maneuver—in which the rover locks its front wheels, rolls the rear wheels forward on individual rocker arms, and then locks the rear wheels and rolls the front ones forward—to scale steeper slopes. The battery-powered 'bot accomplished all this on a modest 250 watts. A moon-bound model would require a long-lasting power source, such as a small nuclear-driven piston engine.