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<p>(DS1), which NASA launched in 1998, demonstrated the long-duration use of a <a href="page.php?w=xenon">xenon</a>-propelled ion thruster on a science mission, and validated a number of technologies, including the <a href="page.php?w=NASA_Solar_Technology_Application_Readiness">NSTAR</a> <a href="page.php?w=electrostatic_ion_thruster">electrostatic ion thruster</a>, as well as performing a flyby of an asteroid and a comet. In addition to the ion thruster, among the other technologies validated by the DS1 was the <a href="page.php?w=Small_Deep_Space_Transponder">Small Deep Space Transponder</a>,</p><p>
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