Here is an update on the MIT design for 10 cm spherical microbots for exploring the planets 1000 microbots would have the same launch volume as the Mars Spirit rover.
They could be used to explore caves and large areas. They have spinoff capabilities for helping the military to search caves and buildings.
Hopping power is provided by a compliant bistable foot operated by Dielectric Elastomer Actuators
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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