What is Olbers' paradox?
Olbers' paradox, also known as the paradox Dark Night Sky, is the name of the problem explaining why the sky is dark at night. The puzzle was first laid at a time when it was assumed that the universe was static, infinite in extent and infinitely old. Based on these assumptions, the sky would seem to be clear, because there would be an endless number of stars that would cover every point in the sky. The paradox is named after Heinrich Olbers, who in 1826 stated that each line of supervision would end up on the star, which will be clear. However, the problem appeared several times earlier in the history of astronomy and returned to the 16th century. In 1610, Johannes Kepler quoted what to become known as Olbers' paradox to show that the universe must be final. However, it seemed that there was a problem with the final universe, which was that it would collapse because of the gravitational attraction of the stars and the planets in it. Most astronomers therefore assumed that the universe was endless, and so the paradox remained.
Initial proposals that most stars were too far to see were quickly rejected. If the universe was infinitely old, the stars light would have an endless amount of time to get to us, so even the farthest stars would contribute to a bright sky. It can be shown mathematically that for an endless universe with evenly distributed stars, the whole sky must be as clear as the average star. The brightness of the stars decreases with distance, but the number of stars increases with distance, without restrictions in an infinite universe. The effects are canceled and leave a clear sky.
various other attempts we have decided to solve the puzzle in the next few hundred years. One early attempt to explain was that most of the star light was covered with dust. Although it is true that the dust clouds in our galaxy block large areas from a perspective if there is an endless number of stars, all the dust would warm upL and shone, just like the stars.
Another proposal was that the stars were not randomly distributed, but were arranged in groups with large gaps between them. Now we know that it is actually: the stars are grouped into galaxies that are grouped into clusters and super -clubs. On the largest scale, however, the universe is homogeneous and Olbers' paradox, as described by Olbers himself, states that each line of sight must end up on the star. In this way, it is clear that not a random grouping of stars could only be responsible for the dark sky if the stars accidentally stood behind themselves, blocked the light of the other-seer that no one could take seriously.
6 It is now known that the observable universe is expanding at a speed that increases with distance, and when we look back in time, we arrive at a small volume point and huge density. This gives two reasons why the sky is dark. The first and most important reason is that the universe has a final age so there would be no time to light from stars outside a certain distance to get to usgot it. The second reason is that the expansion of the universe results in the Doppler shift in the light from the stars that increases by the distance; At some distances, all light would move behind the visible spectrum, which should portray any stars invisible.