It says that variations in earth's movements, specifically in its orbit around the sun, these variations lead to differences in the amount of solar energy that reaches the earth.
这一假设认为，地球运行的变化，特别是绕太阳轨道的变化，会导致太阳到达地球能量的不同。
Moreover, materials that have transitions at the temperatures that terrestrial solar-energy systems are likely to encounter are usually destructively corrosive at those temperatures.
此外，在地球太阳能系统可能遇到的温度下发生转变的材料在这种温度下通常具有破坏性的腐蚀性。
Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems.
在地球上任何一个特定地点，阳光的不断变化使能量储存成为地球太阳能系统的一个必要设计特征。
So the storage of solar energy, lots of solar energy, is a really important aspect.
所以大量太阳能的储存是非常重要的。
That is the biggest drawback to solar energy.
那是太阳能最大的缺点。
They mostly transmit incoming solar energy down to Earth.
大部分的太阳能都会被传输到地面。
Then in the 1970s, there was an interest in solar energy again.
到了20世纪70年代，人们又对太阳能产生了兴趣。
They block most of the solar energy so it never reaches Earth's surface.
它们阻挡了大部分的太阳能，使它永远无法到达地球表面。
For example, solar energy is gathered through large glass panels facing the sun.
例如，太阳能是通过面向太阳的大型玻璃板被收集起来的。
Less solar energy is lost in evaporation at the frigid poles than in the tropics.
与热带地区相比，在寒冷的两极蒸发中损失的太阳能更少。
As fall approaches in the northern hemisphere, the amount of solar energy available declines considerably.
随着北半球秋季的临近，太阳能的可用量大幅下降。
The technology of amplifying solar energy can save the number of semiconductor materials required for photovoltaic cells.
通过放大太阳能的技术可以节约光伏电池所需的半导体材料的数量。
Does that mean that solar energy can only be used on a small scale, like heating a home?
这是不是意味着太阳能只能在小范围内使用，比如为家庭供暖？
In some rural communities of emerging economies, people have begun to light their homes with stored solar energy.
在一些新兴经济体的农村社区，人们已经开始使用储存太阳能，用于家庭照明。
A surface's albedo is the percentage of incoming solar energy, sunlight, that's reflected off that surface back into space.
一个表面的反照率是入射的太阳能、阳光从这个表面反射回太空的百分比。
Let's shift our focus now to some of the technologies that have been invented to overcome the problem of gathering diffused solar energy.
现在让我们转而看看为了克服收集分散太阳能这个困难而发明的一些技术。
It is an increased area of low thick clouds, the type that reflects a rare portion of solar energy back to space and cools the Earth.
它是一片变大的低厚云层，这种云层将少量的太阳能反射回太空，为地球降温。
That is the biggest drawback to solar energy, the problem of what do you do in cases where the sun's light is weak or virtually non-present.
这是太阳能的最大缺陷——当太阳光变弱或者不存在时，人们该怎么解决。
If we could power such an elevator with solar energy, we could simply rise up into space for a fraction of the cost of a trip by rocket or shuttle.
如果我们能利用太阳能为这样的电梯提供动力，我们只需花费乘坐火箭或航天飞机旅行费用的一小部分就能进入太空。
All right folks, let's continue our discussion of alternative energy sources and move on to what's probably the most well-known alternative energy source—solar energy.
好了，朋友们，让我们继续讨论替代能源，来说说可能是最著名的替代能源——太阳能。
Alternative energy sources includes solar energy, wind power and so on.
替代能源包括太阳能、风能等。
The thing is the dream of solar energy is not a new one.
主要是，利用太阳能的梦想并不新鲜。
Solar energy is everywhere, but it's also quite diffused.
太阳能无处不在，但同时又很分散。
Solar energy, whose time has come, is very suitable to heat water or make electricity.
太阳能的时代已经到来，它非常适合用来加热水或发电。
Imagine a world where building the tallest skyscraper wasn't a race of height, but rather one to collect the most solar energy.
想象这样的一个世界：建造最高的摩天大厦不再是一场高度竞赛，而是一个关于能储存太阳能更多的竞赛。
Without sunshine, here is no solar energy.
没有阳光就没有太阳能。
The field of solar energy is developing fast.
太阳能领域正在迅速发展。
It produces more electricity from falling rain than solar energy.
它从降雨中产生的电能比从太阳能中的还多。
We will use solar energy, and we will clean and recycle our water.
我们将使用太阳能，并且清洁和循环利用我们的水源。
In many parts of the world, solar energy is now the cheapest form of electricity.
在世界许多地方，太阳能现在是最便宜的电能。
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