NASA's Developing Robotic "Hedgehogs" to Explore a Martian Moon

Exploring micro-gravity climates like Mars, which has just 38 percent of the Earth's force, or its moon, Phobos, which has 1000 times less gravity than that, can be a challenge for rovers that rely on wheels or skittering legs for traction. That's why Stanford researchers plan to survey the Martian moon with an fleet of bounding, spiked spheres. More