JAKARTA, iNews.id – Blue color dominates during the day. Meanwhile, as the sun rises or sets, the sky becomes more orange. Why is that?
This color phenomenon in the afternoon and evening is related to the scattering of sunlight by gas particles in the Earth’s atmosphere. The National Institute of Aeronautics and Space (LAPAN) explained that this phenomenon is also known as Rayleigh scattering.
Then at night, the sky will appear dark black. However, then there may not be a few questions about whether the sky is really black as seen at night.
Andi Princeg, Research Center science and LAPAN Space, explained that basically black is not a color. Black in the electromagnetic spectrum indicates that each spectrum is mostly absorbed entirely by objects and cannot escape, nor be reflected back by the object.
In other words, black is the absence of light that can be detected by the sense of sight or other optical devices. What’s more, the distance between the stars is far enough not enough to make the star look as bright as the center of the solar system on Earth, namely the Sun.
“What we perceive as color is basically the electromagnetic spectrum that is reflected back into our eyes, which in our eyeballs are three cone cells and one rod cell. All four are located in the retina behind our eyeballs,” said Andi, Thursday (2/9/2021).
“Each of these cone cells is sensitive to three colors: red, green and blue. While rod cells are sensitive to low light intensity. A similar principle is applied by optical devices that use charge-coupled devices or CCDs, a kind of sensor that functions to capture images. ,” he added.
Each electromagnetic spectrum has its own wavelength. The visible light spectrum or the visible spectrum is one of the electromagnetic spectrum that can still be observed by the human eye.
The wavelength range is from 400 to 700 nanometers (1 nanometer = one billionth of a meter). Red has a larger wavelength of 700 nanometers, while purple has a shorter wavelength of 400 nanometers.
Editor: Dini Listiyani
