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=== Solar sail research === {{See|IKAROS}} [[File:IKAROS solar sail.jpg|thumb|[[IKAROS]]]] On 9 August 2004, ISAS successfully deployed two prototype [[solar sail]]s from a sounding rocket. A clover-type sail was deployed at 122 km altitude and a fan type sail was deployed at 169 km altitude. Both sails used 7.5 [[micrometre|micrometer]]-thick film. ISAS tested a solar sail again as a sub-payload to the [[Akari (satellite)|Akari]] (ASTRO-F) mission on 22 February 2006. However the solar sail did not deploy fully. ISAS tested a solar sail again as a sub payload of the [[Hinode (satellite)|SOLAR-B]] launch at 23 September 2006, but contact with the probe was lost. The [[IKAROS]] solar sail was launched in May 2010 and successfully demonstrated solar sail technology in July. This made IKAROS the world's first spacecraft to successfully demonstrate solar sail technology in interplanetary space. The goal is to have a solar sail mission to Jupiter after 2020.<ref>[https://web.archive.org/web/20131017010726/https://www.nikkei.com/article/DGXNASDG06041_W2A201C1CR8000/ ã¤ãĢããšãä¸įåãŽåŽåŽã¨ããã§ãŽããščĒåŽ.] Nikkei. 6 December 2012</ref>
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