Instead of normal planets whose composition could be predicted by theory, the planets populating our solar system are unique individuals whose chemical and tectonic identities were create.

我们的太阳系中的行星不是那些可以通过理论预测其组成的普通行星，而是独特的个体，它们的化学和构造特征都是由它们创造的。

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The theory of "Solar Term" remains important to farmers for guiding their practices and is used widely by communities and shared by many racial groups in China.

“节气说”对农民仍然很重要，因为它指导着他们的生产行为，而且被社区群体和中国的许多民族广泛地使用。

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Certainly, some of the facts at hand are valid; for example, the Maya did have a Long Count calendar, pole-shift theory does exist, and solar activity does wax and wane.

当然，有些事实证据是有效的，比如玛雅人的确有一个长记历的历法，地磁反转理论也的确存在，太阳活动的确在减弱等等。

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In theory, a solar shade could provide any amount of cooling, but the researchers estimate that it would have to have an area of 4.1m square kilometres (half the size of Brazil) to offset half the warming expected over the next century, assuming no cuts in carbon-dioxide emissions occur.

ECONOMIST: Geo-engineering

But the big footie freeze will in theory be powered by solar-heated panels.

ECONOMIST: From the ridiculous to the sublime

In the past, solar eclipses have helped test such things as Albert Einstein's theory of relativity.

CNN: HE GODS WERE DRINKING