Unfortunately, however, this unpredictable phenomenon also causes turbulence, and means that a solar plane has to climb high in the air to get the energy-efficient smooth ride that it needs.

不幸的是，这种不可预测现象还导致湍流，这意味着太阳能飞机必须爬升很高才能高能效地平稳飞行。

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This image captures a momentary line-up looking out along this fundamental plane of our solar system.

这幅图片从黄道平面的视角捕捉到地球、月球和太阳排成一条直线的瞬间画面。

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It is the first solar-powered plane to carry both a pilot and enough battery storage to power flight through the night.

这是第一架携载了一名飞行员和充足电池储量以提供夜间飞行动力的太阳能飞机。

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In 2010, the solar plane flew non-stop for 26 hours to demonstrate that the aircraft could soak up enough sunlight to keep it airborne through the night.

WSJ: Solar plane plans stops in Phoenix, Dallas, NYC

But for a solar eternal plane to be exactly that it needs an efficient energy harvesting, conversion and storage system that will work when the Sun has set.

BBC: NEWS | Science/Nature | 'Eternal planes' to watch over us

And last year, defence firm Qinetiq flew a solar-powered plane for 54 hours, smashing the official world record for the longest-duration unmanned flight.

BBC: Hydrogen-powered plane takes off