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In page Spacecraft propulsion:
"Some spacecraft propulsion methods such as solar sails provide very low but inexhaustible thrust;[4] an interplanetary vehicle using one of these methods would follow a rather different trajectory, either constantly thrusting against its direction of motion in order to decrease its distance from the Sun, or constantly thrusting along its direction of motion to increase its distance from the Sun.[citation needed] The concept has been successfully tested by the Japanese IKAROS solar sail spacecraft.[citation needed]
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