Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction.

在太阳引力的控制下，每个行星都维持在一条椭圆形的轨道上，并按照相同的方向移动。

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"With this we can control both the orbit and the attitude using only sunlight," says Yuichi Tsuda of the Japan Aerospace Exploration Agency.

日本宇宙开发机构的津田雄一说：“借助智能玻璃，我们只要利用太阳光就可既控制飞行轨道又控制飞行姿态。”

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India launched a satellite into moon orbit in 2008, but had to abandon it nearly a year later after communication links snapped and scientists lost control of it.

印度在2008年将一颗卫星发射至月球轨道，不过在一年后，由于卫星通讯突然中断，科学家失去了对其控制而不得不将之抛弃。

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Alongside the HTC-made handset are an altitude and orbit control system, two propulsion setups and a Linux-based computer with a "high-speed" processor.

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The Pyramid acts as a home base and remote control unit for the Orbit and features a custom-designed, reprogrammable micro-controller.

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The control unit ends up in a lower orbit, but it can then use solar power and the electrodynamic properties of the tether to return to its original orbit.

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