天空看起来是蓝色的，而北极熊看起来是白色的，这是为什么呢？一起跟着小编来看看吧~

Light bounces off tiny particles.

光会被微小粒子反射。

When a ray of white light travels through a cloud of particles, some of that light doesn’t make it through to the other side. Where does it go? Light bounces off the cloud’s molecules many, many times, scattering in all directions. When all colours of light scatter equally, you see a white cloud.

一束白光穿过云层粒子，总会有些光束无法完全穿透到达另一面。那么这些无法透过的光束去了哪里呢？一束光经过云层颗粒的多次反射，会散射到各个方向。光束中的所有颜色被散射均匀时，你眼中的云彩就是白色的啦~

Polar bear’s fur isn’t actually white – it’s transparent. The structure of these clear hairs scatters light of all colours – just as the snow around them does – making the bear appear white.

其实北极熊的毛不是白色的而是透明的。北极熊的毛皮结构能够散射所有的颜色的光，其原理与周围的白雪一样，使北极熊看起来是白色的。

Why is the sky blue?

天空为什么是蓝色的？

As sunlight travels toward the earth’s surface, it passes through a mixture of gaseous molecules in the atmosphere. Light waves sometimes bounce off these molecules and scatter in many directions. Sunlight is made up of many different colours, but the atmosphere scatters light at the blue end of the spectrum best. Blue light reaches our eyes from all directions, which is why the sky looks blue from the ground and from an airplane.

阳光想要照射到地球表面上，需要穿过大气层中的气体分子混合物。光在穿过这些颗粒时，会被反射并向多个方向散射。我们都知道，太阳公公的光是五颜六色的，而大气层散射蓝色光的能力最佳。蓝色的光从四面八方散射到我们的眼睛里，这也就是为什么天空从地面和飞机上看起来都是蓝色的。

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