  Wheeled ground robots are limited from exploring extreme environments such as
caves, lava tubes and skylights. Small robots that utilize unconventional
mobility through hopping, flying and rolling can overcome many roughness
limitations and thus extend exploration sites of interest on Moon and Mars. In
this paper we introduce a network of 3 kg, 0.30 m diameter ball robots
(pit-bots) that can fly, hop and roll using an onboard miniature propulsion
system. These pit-bots can be deployed from a lander or large rover. Each robot
is equipped with a smartphone sized computer, stereo camera and laser
rangefinder to per-form navigation and mapping. The ball robot can carry a
payload of 1 kg or perform sample return. Our studies show a range of 5 km and
0.7 hours flight time on the Moon.
