大体上,所有靠近地球的这些物体所反射的光都比来自恒星的要亮。
Basically the light bouncing off all these objects close to earth is brighter than what's coming from the stars.
所有形式的物质,都可以根据它们吸收的光的波长以及反射的光的波长来区分。
All substances, all forms of matter, can be distinguished according to what wavelength of light they absorb and which ones they reflect.
It just checks and sees what kind of light frequencies are bouncing off the object.
只要能让它检验出,物体反射的光的频率
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