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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 Yannick Ngakoue Rush 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 Leonard Fournette Rush Jersey , for those receding they will have redshift. All distant galaxies show redshifts directly depending on their distance, which shows that the universe is expanding.

A roof is one of the most important structures of a building. It serves to protect the inner parts of the building from adverse weather conditions and adds to the aesthetic value of the property. It is imperative that only licensed Woodstock roofers handle any work on your roof.


Due to the great value of the roof Taven Bryan Rush Jersey , it needs regular maintenance and inspection. After a storm, several structures may be dislodged or broken. A contractor will do a thorough assessment and do the necessary repairs. Woodstock contractors participate during the construction of a building. Only an expert can work with high quality roofing solutions and deliver a safe and pleasing structure.


There are many contractors within Woodstock. A person should do a thorough search to get the best company in their local area. The easiest way to conduct a search is by asking for referrals from trusted people around your area such as friends and colleagues. The local yellow pages also contain contact information of various companies. Search through the internet also as this method allows you to have a wider view of the market.


It is wise to at least contact three contractors and interview them before making a final decision. During the interview ask the contractor about their length of working experience. Be keen on their experience on working with the roofing material of your choice. Ask for a list of references and call them. If possible get to see the work that has been recently done by the company. Ask about the nature of their services Jalen Ramsey Rush Jersey , if they do clean up afterwards and the cost of hiring them.


To ensure that you get a top quality company, check and verify a number of credentials. A company providing roofing services in Woodstock must have a business license as required by the law. They must also have certification from institutions that accredits roofers. Additionally Telvin Smith Rush Jersey , they are required to be trained and certified to handle materials from some manufacturers.


An insurance cover is a must for any company seeking to work on your roof. They must have liability insurance and an addition of workers compensation cover for your safety. Get a company which is well bonded for a surety of quality work and protection from damage. Check the reputation of a company by visiting the Better Business Bureau website or Home Builders Association site.

ent specialist who helps individual homeowners make the right choices to protect their home investment. If you are interested in learning more about Woodstock Roof Repair Company he recommends you check out www.mrrooferatlanta.


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