Contents

20 May 2020
Vol 5, Issue 42

About The Cover

Cover image expansion

ONLINE COVER Space Hiking. NASA's Mars exploration rover, Spirit, traveled over 6.5 kilometers on Mars before its right-front drive wheel failed. Spirit's wheel would remain locked in low cohesion sulfate sands; this lack of mobility signaled the end of Spirit's mission. In 2015 NASA developed the Resource Prospector 15 (RP15), a planetary rover with a drive-train that combines wheel spinning with cyclic legged gaits. Shrivastava et al. built a laboratory model of RP15, called Mini Rover, to test the locomotion principles of RP15 and demonstrate hill climbing on loose granular media. This month's cover is a photograph of the Mini Rover. [CREDIT: CHRISTOPHER MOORE/INSTITUTE COMMUNICATIONS, GEORGIA INSTITUTE OF TECHNOLOGY, GEORGIA TECH RESEARCH CORPORATION]