IKAROS is Interplanetary Kite-craft Accelerated by Radiation Of the Sun, a Japan Aerospace Exploration Agency (JAXA)experimental spacecraft. Aboard an active expendable launch system H2A, IKAROS was launched on 21 May 2010.  IKAROS is the first spacecraft to successfully demonstrate solar-sail technology in interplanetary space.
Breakthrough in sailing in first space yacht is very lightweight to open the solar sail (not sale) without bearing axis points. With the late-night skating rink in the early experiments conducted, Curling was used to sail to broaden weights. It’s otherwise known as extended spin, and then open the binder the solar sail deployment is not complete at first or several times at check experiment stages, well hopefully is the solar sailing
What becomes possible. Turnabout is liquid crystal devices are used, LCD power to on transparency and Be a mechanism under pressure of the Sun Ray direction  IKAROS can switch freely from the control of earth staff. 5M in increasing the size of the sale becomes square side is 14m strength is more lightweight polyimide is used. That was used to explore the growth patterns of these represent Japan origami.
Polyimide is Electronic board insulation film and In the material used for insulation of satellites, can join in the heat seamlessly to make easily more material extension.   Polyimide material can became the point of this project with great features, too.

はじめての宇宙ヨットでのセーリングで画期的であったのは支軸を用いずにソーラーセールを開いたために非常に軽量化されている点である。事前実験では深夜のスケートリンクを借りて行われ帆を広げる重りにはカーリングが使われた。これは拡張スピン型と呼ばれる方法で、遠心力を使ってソーラーセールが1次展開し、その後バインダーが開くことでソーラーセール2次展開が完了しソーラー航行が可能となるもの。方向転換には液晶デバイスが用いられ、液晶電源をOnにすると透明化し太陽光線の圧力がかかって方向が自由に転換できる仕組みである。セールのサイズは高さ5mで広げると一辺が14m四方になるが、強度が高く軽量のポリイミドが使用されている。これらの拡張パターンを模索するために用いられたのが日本を代表する折り紙である。 Ikaros計画の責任者としての代表が川口純一郎さんで直接のプロジェクト担当主任リーダーが森治さんである。
■Space Debris
The conflict against is Space debris okay or not? Points to the space garbage itself, Space travel wields is not an issue, for the reason spinning satellites orbit the Earth.

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