Search for information on the Internet

One could mention, at some point, an overabundance of information. In 1999 there were over 800 million documents on the web. Sites commercial, personal, institutional, academic articles, novels, advertising pages, catalogs. More than 100 languages.

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It is enough to look, for example, “ancient history” and confuse you right away. Google has known only in a few years, a phenomenal success. Launched as a simple engine test phase in September 1998 by two Stanford University students, Larry Page and Sergey Brin, search engine inaugurate its commercial version a year later. Google receives every day about 130 million applications worldwide because it is not a search engine like all the others.

Even if based on search keywords, ranked according to the number and sites of origin, Google’s principle is that those sites pay to be shown on top.

 

The “page rank”, invented by two students, is the popularity of the page. Another peculiarity is its strategic ones: while other engines are invaded by dozens of banners on Google, advertising is limited to a few links hypertext discreet on-screen unless you are in relation to the information sought . Also, another feature is functioning in multiple languages. Perhaps even more exaggerated: Hungarian, Serbian, Ukrainian, Turkish, Russian, Polish, Dutch etc.

Since competition in this area is becoming increasingly fierce recently, Google held a contest whose prize was $ 10,000. The winner has created a way that allows you to search by geographic area in which pages are located. But the real winner of the contest can be even as Google has improved its search technology programs received from participants and they can manage liking because conditions in the forms included in the contest.

 

Thus, technologies that Google has received relates to reducing errors in terms of pages created the possibility that hyperlinks are connected better when the target website changes its location, search for information in compressed files etc. Also, Google has launched two sites to develop experimental search and navigation technologies. Home test, Google Labs, allows users to test new technology products research and development team of Google.

 

These experiments include a glossary, an application of voice search, keyboard shortcuts for browsing search results. The second page shows the add-on experimental toolbar’s Google, a download of software that allows users to surf the Web with the browser Internet Explorer from Microsoft to search the Google database through an application persistence included in interface internet Explorer. So currently, Google has the best search engine.

WebCrawler is the first of search robots being launched. Developed under a research project at the University of Washington in early 1994, was a real commercial success. Since the beginning of its operation, its database contained information on 6,000 web servers.

 


At the end of the service received more than 15,000 requests per day. Basically, a robot is composed of three distinct modules; an explorer robot (spider), a system of indexing and searching program (searcher). The portals offer the ability to search the web is going through a directory or by a motor. As a definition, a portal is a website that offers Internet users a wide range of resources and services.

With it, you can find all the information they are looking for and even those that are not looking like the last quotation on the stock exchange, foreign affairs, domestic, economic, sports, social, time management box e- mail, horoscopes, etc. The best example of a search tool became portal Yahoo is even.

About satellites

The satellites are celestial bodies that rotate around another celestial body, folowing it in his movement during the revolution. Their origin, they are divided into two categories: natural and artificial. In astronomy, natural satellites are defined as celestial bodies that executes a secondary rotational motion around a planet or a star. The best know Earth’s natural satellit is The Moon.

Satellite-Image

Although the two are close enough in size to be considered a system. Movement of most satellites is direct, from west to east and the same direction as the planets around which orbits. Only a few satellites of the major planets rotate in the opposite direction; they were likely captured in their gravitational field after a certain period of solar system formation.

For example, Pluto, which rotates around the Sun in an independent orbit satellite is believed to be a kick of Neptune. Recently, it has been discovered that, in turn, and Pluto has a moon. Artificial satellites are placed objects with a definite purpose in an orbit around a planet. Since the launch of the first artificial satellite in 1957, thousands of these worlds created by man were sent to orbit the Earth. Nowadays, they play and important role in the communications industry, in military strategy and scientific studies of the Earth and the Universe.

Some of the first satellites were designed to operate in passive mode. Instead of actively transmit radio signals, they serve only to reflect signals which were directed to them by the ground station worldwide. Nowadays, satellites used exclusively active operating systems, in which each of them carries its own transmission – reception equipment. Hundreds of communications satellites are curently in orbit. They receive signals from a ground station, amplify them, and retransmit them on a different frequency to other stations. The satellites use a range of frequencies measured in hertz, namely frequency band of about 6 GHz. The first active satellite, Score, launched in 19588 by the United States, was equipped with a recording device messages received during passage over a transmission station.

They were retransmitted when the satellite is above the reception station. Telstar 1, launched by American Telephone and Telegraph company in 1962, offering direct TV transmission between the US, Europe and Japan, and can also provide playback of several hundred radio stations. Another satellite, Echo 1, launched by the US in 1960, was constructed of aluminized plastic balloon with a diameter of 30m. In 1964, it was released Echo 2, which have a diameter of 41m. The ability of these systems was limited by the need for powerful transmitters and large antennas on the ground.

Satellites can be connected to a signal system which is called the phone number tracker that enables viewing from space.

Most first satellites included some communication equipment. NASA launched the first satellite phone and televission, AT & T’s Teslar 1, in 1962. US department of Defense launched Syncom 3 in 1964. It was the first satellite that had a geostationary orbit. Since 1957 over 300 satellites were launched communications.


The present offers audio – visual and data transmission. Weather satellites carries cameras and other instruments directed by the Earth’s atmosphere. They can provide warnings about unstable weather and contributes greatly to weather forecasting. NASA launched the first satellite TIROS 1 in 1960, which transmitted approximately 23,000 photographs of the Earth and atmosphere.