NASA bets on solar sails.
A very ingenious concept to propel yourself through space is completely different from solar sails, which do not need to carry a motor or fuel, take advantage of a light pressure from solar radiation to obtain the impulse.
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Solar sails accelerate very slowly, but over time they can reach great speed and could sail forever at least until the sun goes out.
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Solar sail designs are often very large and very thin, and just as boat sails are limited by wind direction, solar sails are limited by direction of sunlight, forcing trade-offs between power and navigation, but this new solar sail has a very special feature, since it would use small grids embedded in thin films in order to take advantage of a property of light called diffraction.
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