an inexpensive unmanned mobile sensor and data collection rolling rover for exploring remote , inaccessible locations , such as deep craters and canyons , includes a hollow enclosure having a flexible wall that is expandable into the shape of a sphere , an apparatus for selectably expanding the wall of the enclosure , a sensor and instrumentation payload disposed within the enclosure and coupled to an inner surface of the wall of the enclosure , and a power supply for powering the payload at its destination . the rollver is adapted to roll to a target destination at least partially in response to at least one of an initial impetus imparted to the vehicle and gravitational forces acting thereon , and due to its relatively low cost , can be simultaneously deployed and used in an area of interest in relatively large numbers .