Why Are Black Holes Black?
What decides the color of an object is what wavelengths of light reflect on it. The wavelength of light reaching our eyes (or telescopes) forms the color components of that object. For example, the reason why a leaf is green is that it reflects the wavelength corresponding to the green at most among all the wavelengths falling on it. The black color (not to be confused with the black light) is formed either by the absence of any light in the medium or by the absorption of all visible light reaching the object.
But the light reaching the black holes is not reflected back. not reflected. The gravitational well is so large that light cannot emerge from the horizon of the black hole. So when you look at a black hole, black eye gives you only one visual impression because there is no light in your eye: it is black. So what you actually see is not a black object, because you cannot see anything, you perceive what you think you see as black. That is why Black holes are black because they do not reflect any light to the observer. It is also useful to open a parenthesis here. Contrary to popular belief, Hawking Glow or Hawking Radiation will not produce a color since it will theoretically radiate outside the visible wavelength. In other words, the word Hawking Glow will give a color to the Black Hole just because there is a glow in it.
However, it is possible to observe black holes as a result of careful observations. In the first place, the indirect effects of black holes were observed by the Hubble Telescope and it was determined that the stars exhibited strange movements around these huge gravitational wells. Then, for the first time in 2016, gravitational waves, which are supposed to be generated as a result of black holes hitting each other, were identified; thus, an important step has been taken to verify the presence of black holes experimentally. Finally, the first black hole photograph that scientists were able to create in 2019 was the ultimate proof of the existence of black holes and the accuracy of the predictions of the Theory of Relativity.
But the light reaching the black holes is not reflected back. not reflected. The gravitational well is so large that light cannot emerge from the horizon of the black hole. So when you look at a black hole, black eye gives you only one visual impression because there is no light in your eye: it is black. So what you actually see is not a black object, because you cannot see anything, you perceive what you think you see as black. That is why Black holes are black because they do not reflect any light to the observer. It is also useful to open a parenthesis here. Contrary to popular belief, Hawking Glow or Hawking Radiation will not produce a color since it will theoretically radiate outside the visible wavelength. In other words, the word Hawking Glow will give a color to the Black Hole just because there is a glow in it.
However, it is possible to observe black holes as a result of careful observations. In the first place, the indirect effects of black holes were observed by the Hubble Telescope and it was determined that the stars exhibited strange movements around these huge gravitational wells. Then, for the first time in 2016, gravitational waves, which are supposed to be generated as a result of black holes hitting each other, were identified; thus, an important step has been taken to verify the presence of black holes experimentally. Finally, the first black hole photograph that scientists were able to create in 2019 was the ultimate proof of the existence of black holes and the accuracy of the predictions of the Theory of Relativity.
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