Essi Satellite | TV & Radio

Essi Satellite | Tv & Radio, Free Persian, Arabic, Turkish Channels

Free installation anywhere in the US, No Monthly Fee

Essi Satellite, TV & Radio For English And International Channel

satellite television channels

This article is about artificial satellites. For natural satellites, also known as moons, see the Natural satellite. For other uses, see Satellite (disambiguation).

“Artificial moon” redirects here. For the electric light used to simulate moonlight, see moonlight tower.

Part of a series on

, Spaceflight, Soyuz TMA-7 spacecraft2edit1.jpg, History, Space Race Timeline of spaceflight Space probes Lunar missions, Applications

Earth observation satellites Spy satellites Communications satellites Satellite navigation Space telescopes Space exploration Space tourism Space colonization

, Spacecraft, Robotic spacecraft, Satellite Space probe Cargo spacecraft Human spaceflight, Space capsule Space station Spaceplane, Launch

Spaceport Launchpad Expendable and reusable launch vehicles Escape velocity Non-rocket space launch

Destinations, Sub-orbital Orbital Moon Interplanetary spaceflight Interstellar travel Intergalactic travel, Space agencies

ESA CSA RKA CNES DLR ISA CNSA ISRO NASA JAXA

Private spaceflight, Bigelow Aerospace Blue Origin Orbital ATK Sierra Nevada Corporation SpaceX Virgin Galactic, RocketSunIcon.SVG Spaceflight portal

vote, File: NASA Earth-observing Fleet June 2012.

A full-size model of the Earth observation satellite ERS 2

In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as Earth’s Moon.

In 1957 the Soviet Union launched the world’s first artificial satellite, Sputnik 1. Since then, about 6,600 satellites from more than 40 countries have been launched. According to a 2013 estimate, 3,600 remained in orbit.[1] Of those, about 1,000 were operational;[2] while the rest have lived out their useful lives and become space debris. Approximately 500 operational satellites are in low-Earth orbit, 50 are in medium-Earth orbit (at 20,000 km), and the rest are in geostationary orbit (at 36,000 km).[3] A few large satellites have been launched in parts and assembled in orbit. Over a dozen space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Mercury, Venus, Mars, Jupiter, Saturn, a few asteroids,[4] a comet and the Sun.

Satellites are used for many purposes. Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, and space telescopes. Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit.

A launch vehicle is a rocket that places a satellite into orbit. Usually, it lifts off from a launch pad on land. Some are launched at sea from a submarine or a mobile maritime platform, or aboard a plane (see air launch to orbit).

Satellites are usually semi-independent computer-controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control and orbit control.