A huge "heap", near Husband's top (3)

E' la NASA stessa a spiegarci che:"...On the new terrain that Spirit has reached, the Rover slipped 45% on an 11° slope. In the past, when Spirit was on an 11° slope, the Rover did not slip as much, but this terrain is much sandier than previous terrain Spirit has driven on. The Rover used to have a slip limit at 40%, so the Rover would automatically shut off if it slipped that much. The Rover team increased the allowable slippage to 60% in order to enable the Rover to progress and move forward...".