Jakarta –
During the day, the sky will be a bright light blue. Then it turns as the sun goes down to orange. And, the night turns black. The question is, what is the most dominant color in the world? universe?
Regarding this question, the National Aeronautics and Space Administration (Eight) gives the scientific answer.
Lapan said the phenomenon was related to the scattering of sunlight by gas particles in Earth’s atmosphere. This phenomenon is also known as Rayleigh scattering.
Andi Pangerang, Researcher at the Center for Science and Space at Lapan, said 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 these objects.
In other words, black is the absence of light that can be detected by our sense of sight or other optical instruments. What’s more, the large enough distance between the stars is 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, where in our eyeballs there are three cone cells and one rod cell,” said Andi.
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A natural phenomenon when the Earth continues to be bombarded by asteroid particles from outer space. Photo: Getty Images/Dan Kitwood– |
“All four are located in the retina at the back of our eyeballs. Each of these cone cells is sensitive to three colors: red, green and blue. Meanwhile, rod cells are sensitive to low light intensities. A similar principle is applied by optical instruments that use charge-coupled device or CCD, a kind of sensor that serves to capture images “, said Andi.
Each electromagnetic spectrum has its own wavelength. The visible light spectrum or the visible spectrum, including one of the electromagnetic spectrum that can still be observed by the human eye.
The wavelength range is from 400-700 nanometers (1 nanometer = one billionth of a meter). Red has a larger wavelength, which is 700 nanometers, while purple has a shorter wavelength, which is 400 nanometers.
Wilhem Wien in the late 19th century found that the greater the temperature emitted by a black body (an object that absorbs all electromagnetic radiation without any light escaping), the wavelength when the radiation energy is maximum becomes smaller.
Next page: star color changes with age…
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