05-05-2016, 08:59
Hmmm... accordingly to some pedants, all stars are black in the strict scientific sense of the word. That is, they do not reflect any of the light that falls on them.
A tree is green because it reflects mostly light from the green part of the spectrum. A burned tree stump reflects little or no light, therefore, like the sun, it is black. What we call sunlight, or starlight, is an example of "black body radiation." The burned tree stump also emits black body radiation, but its temperature is much lower than that of the sun, therefore it emits in the infra-red so you need special glasses or cameras to see the "light" it emits.
A tree is green because it reflects mostly light from the green part of the spectrum. A burned tree stump reflects little or no light, therefore, like the sun, it is black. What we call sunlight, or starlight, is an example of "black body radiation." The burned tree stump also emits black body radiation, but its temperature is much lower than that of the sun, therefore it emits in the infra-red so you need special glasses or cameras to see the "light" it emits.