Hot things glow because of black body radiation, which we talked about in our video about the color of the universe.
由于黑体辐射的关系，灼热的物体会发光，这在我们以前的影片中讲宇宙的颜色时谈过。
Black Body Radiation
原声例句
PBS趣味科普
英语百科
Black-body radiation
![9-year WMAP image (2012) of the cosmic microwave background radiation across the universe.[27][28]](/uploads/202412/24/Ilc_9yr_moll40964056.png)
Black-body radiation is the type of electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, or emitted by a black body (an opaque and non-reflective body) held at constant, uniform temperature. The radiation has a specific spectrum and intensity that depends only on the temperature of the body.
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