Artificial satellites

Man’s first steps in conquering outer space was the launch of the Earth’s artificial. Like the moon, build and launch satellites for humans are bodies that move in orbits around the Earth, outside the earth’s atmosphere year, for a limited period or forever. The launch artificial satellites of the Earth could be done only after improvement multistage missile, whose powerful drive was meant to allow a speed of about 9.7 km / s required for placing a body in a circular orbit at a height not too much of the Earth’s surface.

Earth’s first artificial satellite Sputnik was launched in 1957 by the USSR. Today the largest building space is located in the International Space Station, which is permanently occupied by three astronauts and orbit the Earth at an altitude of about 350 km. Other spacecraft have become artificial satellites after they arrived (MRO type wells, located in Martian orbit, Cassini (Saturn), Galileo (until 2003 orbited the Jovian system) etc. Currently are placed in Earth orbit 975 functional or non-functional artificial satellites.

International Space Station is an experimental space station located in space. It can serve as a living space for the crew, command post for operations in orbit around the Earth and the port beam and mooring for small spacecraft. The purpose for which it is built is studying the effects of microgravity and maintain life in space and as a platform for astronomical observation and earth. Being placed in orbit at an altitude ranging between 319.6 km and 346.9 km, it is an artificial structure in space that can be seen with the naked eye from Earth. International Space Station is a project involving five major space agencies: NASA (USA), RKA (Russia), JAXA (Japan), CSA (Canada) and ESA (an association of several European countries).

They are the main features of a satellite payload mass, lifetime, and orbiting platform. The payload is the subassembly that aims to better fulfill its mission satellite. Electricity is needed for electronic circuits and other electrical systems. This is provided by large panels of photoelectric cells or solar.

Some satellites are positioned on their cylindrical outer surface of the cylinder, so that the part of the body is continuously exposed to sunlight. Others have large expandable panels that are oriented to capture maximum light. Today, these panels are capable of producing many kilowatts needed to power storeys high output power used in many transponders. Satellites also need battery backup that can be loaded from the main solar cells. They are necessary during periods when the satellite is in sunlight and must be strong enough to power the satellite during the entire period of darkness.Phone number tracker is a apps for helps to identify smartphone used gps satelite.

There are a variety of different orbits of satellites that can be adopted. The choice between them will depend on the service, which must assure the satellite and the area you need to serve. In some cases it can be low orbit just 160 km, while others may be more than 36 000 km. Since satellites revolving around the earth, they are attracted by gravity. If a move would not own, would fall back to Earth, turning into the upper atmosphere. Phone number tracker is a apps for helps to identify smartphone used gps satellite.

However, the rotary motion around the Earth has an associated force (centrifuges) which pushes the satellite, moving it away from Earth. The lower orbit, the gravitational pull is greater and the satellite should rotate around the earth quickly, to counterbalance this attraction. At heights greater gravitational pull is less than angular velocity and consequently should be lower. For a very low orbit, located somewhere 160 km, velocity is needed around 21 160 km / h and this means that the satellite will circle the earth in about 90 minutes. At an altitude of 36 000 km, it required a rate of almost 11 265 km / h, giving a rotation period of 24 hours (this value – speed satellite geostationary – give equaling the angular velocities of the two bodies gravitational satellite and earth).

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