辐射是什么模样的？What does radiation look like?

@xuejianosaka @Havenlust @TulipPenney 辐射本质上是肉眼看不见的，但可以通过各种方法检测其存在。例如，伽马射线和 X 射线可以用专门的仪器测量，而可见光和红外辐射可以用眼睛感知。发射辐射的物体的颜色可以表明其温度，较冷的物体呈现红色，较热的物体呈现蓝色或白色。

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