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A small gray plastic robot shaped like a wedge (with propellers and flaps for steering) glides through the blue waters of a competition swimming pool.

Mini NASA Robot Takes a SWIM

This robot prototype was built at NASA's Jet Propulsion Laboratory in Southern California to demonstrate the feasibility of a mission concept called SWIM, short for Sensing With Independent Micro-swimmers. SWIM envisions a swarm of dozens of self-propelled, cellphone-size robots exploring the waters of icy moons like Jupiter's Europa and Saturn's Enceladus.

Image Credit: NASA/JPL-Caltech

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