Space Surveillance Network [ edit ]

The United States Space Surveillance Network , a division of the United States Strategic Command since the beginning of the space age with the launch of Sputnik 1 by the Soviet Union in 1956.(SSN) is following objects orbiting the earth. Since then, SSN has tracked more than 26,000 objects. SSN is currently tracking more than 6,000 artificial satellites. The rest have re-entered the Earth's atmosphere and become isolated, or have remained intact during re-entry and crashed into the Earth. SSN tracks objects with a diameter of 10 centimeters or more; This includes the cost of a rocket weighing just 10 pounds, with a few tons of artificial satellites currently orbiting the Earth. About seven percent of the active satellites (i.e. ~ 560 satellites), all the rest are space debris . ^[15] The U.S. Strategic Command is primarily interested in active satellites, but also tracks space debris that may be mistaken for incoming missiles.

There are three primary categories of satellite (civilian) services: ^[16]

Fixed satellite service [ edit ]

Static satellite services handle hundreds of billions of voice, data, and video transmissions across specific points on Earth's surface across countries and continents.

Mobile satellite services [ edit ]

In addition to serving as a navigation system, mobile satellite systems help connect remote areas, vehicles, ships, people and aircraft to other parts of the world or to other mobile or stationary communications units.

Scientific Research Satellite (commercial and noncommercial) [ edit ]

Scientific research satellites provide information on weather data, land survey data (e.g. remote sensing), amateur (HAM) radio, and other scientific research applications such as geology, marine science, and atmospheric research.

• Astronomical satellites are satellites used to observe distant planets, galaxies and other outer space.

Hubble Space Telescope

• A biosatellite is a satellite designed to carry living creatures for scientific experiments.
• Communication satellite A satellite placed in space for the purpose of telecommunication . Modern communications satellites typically Geosynchronous orbits , Molniya orbits or low Earth orbit using.
• Earth observation satellites are satellites designed for civilian use, such as environmental monitoring , meteorology , mapping ,etc. (See Earth observation system )
• Direction satellites are satellites used by mobile receivers to determine one's exact position using radio time signals.
• Killer satellites are satellites built to destroy enemy warheads, satellites and other space resources.
• Sailor spacecraft are huge satellites that are able to place people in an orbit and bring them back to Earth. (US Apollo lunar module program was an exception, because it did not have the power to bring people back to earth.) Re-use of the space flight of the spacecraft with greater propalasana or landing facility. In orbital stations and they can be used as transport. These can be used at orbital stations and for transportation from there.
• Miniaturized satellites are unusually low-mass and small-sized satellites. ^[18] New classifications are used to classify these satellites: minisatellite (500–1000 kg), microsatellite (below 100 kg), nanosatellite (below 10 kg). ^{[ Citation needed ]}
• Inspection satellites areearth observation satellites or communications satellites designed for military or intelligence purposes. Little is known about the full power of these satellites, as the governments that operate them usually keep secret information about their visiting satellites.
• Recovery satellites carry out inspections, biological, space production and transport of other objects from orbit to Earth.
• Space-based solar power satellites are proposed satellites that collect energy from sunlight and send it to Earth or elsewhere.
• A space station is an artificial structure in orbitdesigned for human survival in space . What sets one space station apart from other crew spacecraft is its lack of large propulsion facilities. Space stations are designed for medium-term stays in orbit for weeks, months, or even years.