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In 1981, he and Gregory Matloff wrote a classic paper about using solar sails to reach Alpha Centauri, the nearest star to our sun.
One of Cosmos 1
In 2003, LGarde, together with partners JPL, Ball Aerospace, and Langley Research Center, under the direction of NASA, developed a solar sail configuration that utilized inflatable rigidized boom components to achieve 10,000 m2 sailcraft with a real density of 14.1 g/m2 and potential acceleration of 0.58 mm/s2.