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A celestial body in orbit around another celestial body is a large satellite. An artificial satellite is a manufactured object or vehicle intended for Earth's orbit, the Moon or other celestial body. From October 4, 1957 humanity is capable of putting satellites orbiting the earth. The Russians were the first to Sputnik, a small satellite orbiting the Earth for a couple of months and send sound signals for 21 days.

The United States launched its first satellite 31 January 1958. This satellite was named Explorer 1, and through the data transmitted to Earth by the Explorer 1, scientists have discovered the radiation belts Van Allen, the areas in space around Earth and the planets Jupiter and Saturn, which contains protons of high energy electrons.

There are 50 satellites did not exist. From Sputnik more than 4,800 satellites have been launched by governments and private companies worldwide. Satellites used for television satellite, of course, but much thinner, satellites.

Types of satellites

The Moon is a satellite of the earth, the earth is a satellite of the sun. The first is called the Moon, the second of a planet. The man made (artificial) satellites into orbit a celestial body and are always a satellite earth orbiting the moon, sun or other celestial body.

We use satellites for different purposes and all the satellites can be placed in one of the following Categories:

Satellite communications

Distribution of television signals and audio, and phone jacks satellite are performed by communications satellites. These types of communications in general need a satellite in geostationary orbit. In 1964, the Defense Department U.S. launched the first satellite was placed in geostationary orbit. This satellite was named Syncom 3.

Today Geostationary satellites used to provide voice, video and audio media such as satellite TV Dish Network Satellite.

Satellite Navigation

These satellites have been very useful for transport companies, in particular the transport of water and air. GPS satellites in Earth orbit low (LEO) and can determine the position with an accuracy of 1 cm (0.4 inches). However, the precise positioning is available for military purposes. For use commercial precision is less accurate.

Navigation satellites are also used for distance measurements, for example, between buildings.

Weather satellites

Earth observation satellites is the task weather, and especially what is happening in atmosphere. Different types of cameras, infrared cameras are used to observe the normal or the same part of the earth from geostationary orbit, or closer their polar orbits to obtain more detailed images. These low-orbit meteorological satellites to focus more on the study of the atmosphere above the current weather conditions, it self.

Military satellites

Very similar to the weather satellites, military satellites also used for Earth observation. In general, high-resolution cameras and instead of normal communications equipment, also use encryption. Sometimes this kind of satellites are very different types of orbits. For example, a highly elliptical orbit that carries the satellite away from Earth as the moon and close to the earth in its early atmosphere, coming as close as possible to the earth surface without falling into the earth.

Probably a lot more tactical used, but for obvious reasons, they are unknown.

Scientific Satellites

Earth observation for scientific purposes, also is very possible with satellites. Make cards with low polar orbit satellites, for example, but also measure the exact shape of the earth, geological research, so everyone can benefit enormously from scientific satellites.

But scientific satellites are not only used for earth observation. The benefits of the search space as scientific satellites. For example, the Hubble satellite is actually a huge telescope around the Earth. Because Hubble was not "see" through the atmosphere, which can produce much clearer and more detailed images of telescopes on Earth.

About the Author: Gary Davis has many years experience in the Satellite TV Industry and has written numerous articles on the topic. To learn more about satellite television, visit Dish Network Satellite TV at http://www.dish-network-satellite-tv.ws

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