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It was long before science became compartmentalized. Professions could freely intermingle and overlap. Wilhelm Olbers was a German physician who enjoyed exploring the night sky with his telescope. His work on comets and asteroids earned him a fairly respectable niche in astronomy Cheap Troy Tulowitzki Jersey , still he continued to be a physician. But something about the night sky kept bothering him. Almost towards the end of this career he brought it in the open. In 1826 he wrote a paper and asked the question ? Why is the sky dark at night?


Until then and even through the nineteenth century it was generally believed that the universe was infinite with infinite number of stars. Newton argued in its favor and explained why it should be so. Newton's eminence and stature notwithstanding Olbers was not convinced. He reasoned that if there were infinite number of stars, the sky would be covered with stars. No matter how far they were the cumulative effect of the star light would ultimately make the sky as bright as the sun. Yet the night sky is dark.


Olbers was the first to address the scientific community with this problem and this is known as Olbers paradox. It turns out though that a Swiss astronomer Cheseaux had made the same observation half a century ago and had mentioned it in his book. Apparently Olbers never read that book and came upon the idea on his own. He tried a couple of explanations but found them unsatisfactory. Finally he assumed that the light from the stars was absorbed by the interstellar gas and rested his case. Later though it turned out that this explanation would not fit either. The interstellar gas will be eventually heated to bright glow and the sky will be again as bright as the sun. So the paradox remained unresolved.


A century after Olbers had put his question Edwin Hubble discovered the expansion of the universe from the observation of redshifts. The answer to the question was: the sky is not dazzling bright because the universe is spending its energy in expanding. The radiation from the galaxies and stars is mostly dumped into the redshift. Whatever remains is so thinned out over the vast distance as to be negligible. The night sky thus remains dark.


Redshift is the term used for the shift of the frequency of light towards the red end of the spectrum due to the source moving away from the observer. This occurs due to a phenomenon known as Doppler Effect. The frequency emitted by a source increases if it is approaching and decreases if it is receding. For example the whistle from an approaching train becomes higher pitched if it is approaching and lower pitched if it is moving away. In the case of visible light the two ends of the spectrum are blue and red. For stars or galaxies approaching the earth the spectral lines will have a blueshift, for those receding they will have redshift. All distant galaxies show redshifts directly depending on their distance Cheap Mariano Rivera Jersey , which shows that the universe is expanding.


Finding Cheap Used Cars at Affordable Prices Autos Articles | November 25, 2008
This article elaborates useful tips on finding cheap used cars, second hand cars Cheap Alex Rodriguez Jersey , new cars at affordable and discounted prices.


If you want to buycarsthat have been used, you shouldbe very careful in choosing genuine cars. Usually, a lot of companies and garages advertise for used car sale Cheap Mickey Mantle Jersey , but you?ve got to be very careful with the choice that you make. Used cars are cheap cars no doubt, but they can come with a lot of defects and technical problems and therefore, you must see to it that the car that you choose is free of all defects. It is good to take a car expert with you for selecting an affordable car(s) before finally purchasing it. The dealer will not be able to deceive you in anyway regarding the car that heshe is selling you in the presence of a person who is well conversant with the sale and purchase of used cars.


You can select discount cars that have been used but still in good condition from some of the genuine websites available on the Internet. They have information about a wide range of discounted car. You need to make your choice known by selecting your preferred model from the dropdown list. You can filter your search by placing your desired price range. Before purchasing used cars you should always verify their credentials. They should have proper registration numbers and other details. You can specify a lot of other features such as Cheap Babe Ruth Jersey , the body type, the year of manufacture, the kilometer range Cheap Derek Jeter Jersey , the transmission type, the color preference etc.


Used cars are being increasingly opted for owing due to their low prices, but they should be purchased only from reliable sources. Otherwise Wholesale Yankees Hats , it is better to go for new carswhich run a low risk of having any defects. Many dealers of used cars sell wholesale car(s) too.


How to choose used cars?