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That's interesting! I was thinking of how the spikes would help the bots move, and found the answer in this Stanford University article:

The hedgehogs do not have wheels, as do the current Mars rovers. Instead they rely on three rotating discs enclosed within each hedgehog, with each disc pointing in a different direction.

In the microgravity of Phobos, the inertial forces of the spinning disks allow the hedgehogs to move nimbly and precisely in environments that would leave other robots bouncing or floating uncontrollably. Quickly accelerating the discs causes the hedgehog to hop, while spinning them even faster results in a bound. Accelerating the discs just slightly makes the hedgehogs tumble, ideal for fine maneuvering.
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