It is long known that Earth's orbit around the Sun changes periodically, cyclically affecting the way solar radiation strikes the Earth.

人们早就知道，地球围绕太阳的轨道会周期性地变化，周期性地影响太阳辐射照射地球的方式。

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These early ancestors of modern Eurasians disperse into parts of the world that had more seasonal sunshine and much lower levels of sun radiation.

这些现代欧亚混血儿的早期祖先分散到世界各地，那里有更多的季节性日照和更低水平的太阳辐射。

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For instance, without a tree to absorb radiation from the Sun, to offer shade, the full intensity of that radiation reaches the ground.

例如，如果没有树木来吸收太阳的辐射并提供树荫，那么太阳辐射就会完整地到达地面。

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The ozone layer protects living things on the Earth's surface from the Sun's ultra-violet radiation.

BBC: Ill wind 'killed dinosaurs'

Certain elements on the surface emitted X-rays when the sun zapped Eros with an intense burst of radiation for 30 minutes on May 4.

CNN: Asteroid Eros resembles 'building blocks' of Earth

The first, solar-radiation management, focusses on reducing the impact of the sun.

NEWYORKER: The Climate Fixers