Astronomy, why is the sky dark

"Why is the night sky dark?" (Hienrich) People have asked this question for thousands of years. That is Alvar's paradox. Astronomers are approaching the answer, but nobody has found a limited answer. As scientists collect data ruthlessly and want to find clues about answers to this mystery we seem to understand that the reason may be that we can not understand the answer . Over the years, several explanations have been considered. But for the moment there are only two reasons why it seems to answer immediate questions.

Aboriginal people in Australia developed astronomy in which letters in the myth are represented by dark spots, stars and other features of the night sky. These figures come from familiar animals and things around us, with stories that explain their origin and function. In the night sky of Australia, there are black spots or clouds next to Southern Cross. This is called Callsac Nebula. This dark place is associated with "empty cockroaches" that represent the head, body and leg formed by the dust trail through the Milky Way. This is a brief explanation of the Australian indigenous astronomy, followed by the folk tales of the blind man and the lady. Next, look at the empty rock sculpture and the position of the night sky celestial body, combine the importance of both indigenous peoples.

Although the astronomical story of different cultural groups is different, there is a general story about the bustle of the sky (not a star like astronomy) but it can be seen in the dark nebula of the Milky Way. Researchers at Australian National University will explain how Emu forms seasonal markers as follows. In winter, the appearance of Emu changes as the foot disappears, so this time male Emu hatches new chicks. This time also an egg collection. At the end of winter, Im starts to blur and the shape of the body is now the shape of an egg egg. This indicates that the chick hatches and the eggs are no longer available.

Astronomy is very sensitive to light damage. The night sky seen from the city is similar to what is not seen in the dark sky. Skyglow (scattering of the light in the atmosphere at night) lowers the contrast between the stars and the galaxy and the sky itself, making it difficult to see the dark ones. This is the factor that brought the construction of a new telescope in increasingly remote areas. Some astronomers reduce the influence of light contamination by filtering through a narrow band "nebright filter" that allows only specific wavelengths of light common in the nebula, and by filtering through sodium and mercury vapor There are also things that use a broadband "light pollution filter" that is designed to be lightweight. The line of light emitted by light enhances the contrast and improves the field of view of dark objects such as galaxies and nebulae. Unfortunately, these light contamination reduction (LPR) filters do not solve the problem of light contamination.