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Published on January 11th, 2013 | by James Ayre


Electric Solar Sail Technology Moving Forward, “Impossible To Create” Electric Sail Tether Produced

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January 11th, 2013 by
The electric solar sail, or ESAIL, is a ‘sail’ that provides propulsion for a spacecraft simply by using the solar wind, no fuel whatsoever. Invented only very recently, in 2006, a prototype has not yet been created. But now one of the primary limitations have been overcome, the production of the 1-km-long ESAIL tether, something which had been considered impossible by most global experts in ultrasonic welding.


The technology, which works by creating a electric field that deflects solar wind protons and takes momentum from them, offers the future possibility of fast, cheap, and fuel-less travel throughout the solar system. And perhaps more interestingly, an economically viable way to extract resources from asteroids.

Four years ago, it was the view of international experts in ultrasonic welding that it would be impossible to produce tethers made of extremely thin wires welded together every centimeter. (It’s necessary for the tethers to be created this way, though, so that micrometeoroids, like those that cause meteor showers, don’t cause debilitating damage to the structure.)

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About the Author

's background is predominantly in geopolitics and history, but he has an obsessive interest in pretty much everything. After an early life spent in the Imperial Free City of Dortmund, James followed the river Ruhr to Cofbuokheim, where he attended the University of Astnide. And where he also briefly considered entering the coal mining business. He currently writes for a living, on a broad variety of subjects, ranging from science, to politics, to military history, to renewable energy. You can follow his work on Google+.

  • Ronald Brak

    Those metals we mine didn’t come from asteroid impacts after the earths crust cooled. We get a little nickel and iron directly from meteorite impact sites, but that’s about all. See that external hard drive sitting on your desk? Yeah, that’s it. The one with all the German movies on it. The steel in its case came from iron deposits in Australia that were formed over two billion years ago when photosynthesis started releasing free oxygen into the air and started making the iron dissolved in the oceans rust. Iron that was for the most part already there when the earth’s crust formed. Other metal deposits on earth are generally created by the action of water and geothermal heat and since these are lacking on asteroids they tend to be lousy sources of metals other than iron and nickel as the metals are evenly spread instead of concentrated. Asteroid impacts can make conditions that are suitable for the formation of ore deposits, such as cracks in rocks that helped create gold deposits in South Africa, but they don’t directly provide the metals we mine.

    • Nathan

      The iron that was dissolved in the ocean was largely brought there by asteroid impacts. During the Earth’s formation all of the siderophilic (iron-loving) elements are thought to have been pulled into the core by gravity, leaving the crust devoid of them. The crust was then reinfused with these elements as a result of the enormous asteroid bombardments that the Earth experienced in its early days.

      • Ronald Brak

        I thought you were saying that ore deposits are the direct remains of asteroids. I thought that was the case you seemed to be suggesting that asteroids would be good sources of metals other than iron and nickel when they don’t have ore bodies.

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