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NASA Wants to Power Robots With Microbes

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For NASA’s Martian rovers, it seems that bigger is better. The $2.5 billion (£1.6 billion) Curiosity — which is currently whizzing towards the red planet following its November 2011 launch — is five times bigger than twin predecessors Spirit and Opportunity.

In fact it’s taller than most basketball players at 2.2 meters high, and is about the size of a small SUV with its three-meter length. Add on its humongous robot arm, which can reach out another 2.2 meters, and you’ve got only seriously huge rover.

To power such a beast needs a lot of energy and the robot packs a radioisotope power system that generates electricity from the heat of plutonium’s radioactive decay. It will fuel the enormous rover for at least 687 Earth days (one Martian year).

But at the US Naval Research Laboratory, space roboticists are researching planetary explorers at the other end of the size spectrum. While Curiosity weighs about the same as a giraffe (900kg), these autonomous micro-rovers would be lighter than a bag of sugar, at just one kilogram.

Gregory Scott at NRL’s Spacecraft Engineering Department has been awarded a NASA Innovative Advanced Concepts (NIAC) research grant to investigate the initial phase of tiny planetary robots that are powered by bacteria.

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