Satellite

A satellite is such an object which has been placed into earth's orbit by human endeavour. Such objects are called artificial satellites to differentiate them from natural satellites like the Moon.Satellites are used for a large number of reasons. Most useful types include military and civilian Earth observation satellites, communications satellites, navigational satellites, weather satellites, and research satellites. 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 classes include low Earth orbit, polar orbit, and geostationary orbit.

There are two types of satellites:

1. Natural
2. Artificial

Natural Satellites are:

Types of Satellite (Artificial) and their works are:

• Anti-Satellite weapons or "Killer Satellites" are satellites that are designed to destroy enemy warheads, satellites, other space assets.
• Astronomical Satellites are satellites used for observation of distant planets, galaxies, and other outer space objects.
• Bio-satellites are satellites designed to carry living organisms, generally for scientific and Engineering experimentation .
• Communications satellites are satellites located in space for the purpose of telecommunications. Modern communications satellites typically use geosynchronous orbits or Low Earth orbits.
• Miniaturized satellites are satellites of unusually have low masses and small sizes.
• Navigational satellites are satellites which use radio time signals transmitted to enable mobile receivers on the ground to determine their exact location.
• Reconnaissance satellites are Earth observation satellite or communications satellite deployed for military or intelligence applications. Very little is known about the full power of these satellites, as governments who operate them usually keep information pertaining to their reconnaissance satellites classified.
• Earth observation satellites are satellites intended for non-military uses such as environmental monitoring, meteorology, map making.
• Tether satellites are satellites which are connected to another satellite by a thin cable called a tether.
• Weather satellites are primarily used to monitor Earth's weather and climate with environmental change.
• Recovery satellites are satellites that provides a recovery of reconnaissance, biological, space-production and other payloads from orbit to Earth.
• Manned spacecraft (spaceships) are large satellites able for put human into an orbit, being on it and recovery back to Earth. Spacecrafts, and orbital parts-spaceplanes of reusable systems also, has a major propulsion or landing facilities, and often uses as transport to and from the orbital stations.
• Space stations are man-made orbital structures that are designed for people to live on in outer space. A space station is distinguished from other manned spacecraft by its lack of major propulsion or landing facilities. Space stations are designed for medium-term living in orbit, for periods of weeks, months, or even years.