Why do we need artificial satellites?

Answer 1

DMSP, or Defense Meteorological Satellite Program, satellites were initiated by the Department of Defense. These satellites are used to provide important information to the military concerning weather conditions. Most commonly this information is used by the Air Force.
Strategic and tactical weather prediction.

Answer 2

"Natural Satellites"

Circle around larger, more massive objects (the Earth is technically a satellite of the Sun, and the Moon is a natural satellite of the Earth).

Artificial Satellites

Satellites orbit the Earth to provide links between places on the planet (TV, phone, internet) and to study the Earth and space. They provide information to the military, to weather forecasting, to geologists, and more. The orbiting space telescopes examine other planets and stars.

Satellites orbit in a variety of directions, but most circle west-tp-east at various heights above the Earth's atmosphere. Geostationary satellites seem to stay in one place, but they only in very high orbits. Geosynchronous satellites orbit exactly once a day, so they stay over the same location on the ground.

(see related question)

• Communications - This includes television, phones (cellular as well as others), and internet. Satellite Television providers, for example, broadcast a one-way signal with audio and video programming to their customers. This is of great use for customers who are in areas too remote to use cable or other wired means, or for mobile users in vehicles and boats. Customers simply tune their in-home receivers to the sub-channel they desire and watch digital programming direct from space.
• Earth Observation and Surveillance - Military reconnaissance satellites and civilian mapping satellites use high-resolution cameras to take photos of the earth's surface for mapping or intelligence purposes. Further, these cameras are not limited to the visible light spectrum, and so some are dedicated to infrared or ultraviolet sensing, which are used by environmental researchers and agriculturists; this can help them determine the temperature, quantity of foliage, chemical composition of the air in different locales, changing height of the polar ice caps, shoreline erosion, or mapping of warm and cold ocean currents. Other uses include popular web applications, surveying, real-time weather observation, and natural resource detection and management.
• Navigation - Global Positioning System (GPS) satellites function by emitting a specific signal pattern. Variations in this signal can be detected by GPS receivers to determine a GPS user's location relative to the satellite by using a principle called the Doppler Effect. The Doppler effect is the apparent compression or decompression of signals that occurs when the signal source is in motion, relative to a listener, for example, why a train whistle changes pitch when it approaches or departs from the listener. By calculating the amount of compression in the signals for multiple satellites, a GPS receiver can pinpoint the user's location.

Because of the large distance between satellites, distances from Earth to distant stars and planets can be determined more accurately (greater parallax). Also, on board cameras can better view objects on Earth in 3 dimensions.

There are many purposes for placing satellites in orbit. First and foremost, communications satellites exploit their great distance from the earth to transmit their signals the greatest distance possible. Many modes of communication, chief among them microwave, travel by 'line of sight,' meaning that one must be in a direct, unobstructed sight line in order to receive a signal. The earliest communications satellite received and relayed microwave communications from large ground stations. Today, we have technology to communicate directly through such satellites using satellite phones. Satellite communication permits direct communication beyond the horizon that might not otherwise be possible with conventional VHF (Very High Frequency) communication (ie, radio).

Still other satellites are used for assorted experimental purposes, exploiting the lack of vibration, low temperature and low gravity of space as an ideal location for extremely sensitive instruments, such as the Hubble Space telescope and similar projects, which are able to see much deeper and more clearly into the cosmos without having to look through the earth's atmosphere first.

A special category of satellite is one that is manned, such as the International Space Station (ISS), and they are used for exploration and research into the effects of long-term low gravity, international cooperation and the promotion of peace, among other purposes.

Communication satellites can be used to send telephone messages or TV pictures. A satellite can be used for working out what the weather will be like in a few days. It has a sensor which send a television call to earth telling us what's going to happen. They can also be used for spying and navigation and they can spot forest fires and water pollution.
1st letter is S and ends with E!
it transmits radio/ televideo/etc. waves
It helps us by like if we atrapped some where and u have afone on u u can call 911 or someone who willhelp u
They are used for exploring different planets in our solar system, transmitting radio, telephone, and television signals, and to tell what the weather is going to be like.
many sencitest send artifical satalites some revolving around the earth. it is used dish antena
The primary uses for an artificial satellite, given our current technology, are:

• Communication (television and cell phone satellites)
• Observation (the Hubble Space Telescope, weather satellites, )
• Location (the GPS system)
• Habitation (Skylab, Mir, the International Space Station)

As our technology continues to expand, it's likely that uses for artificial satellites will as well. For example, a military satellite might provide a way to defend specific nations, or even the Earth as a whole (from a meteor strike, for example). Or, as seen on sci-fi TV shows, a space dock could allow the repair and refueling of space vehicles, without the need to return to our planet's surface. There could eventually be space hotels, low- and zero-gravity tourist attractions, zero-gee factories, controlled-gravity hospitals... The list is bounded only by our imagination, and economic considerations.

Answer 3

We really depend on satellites and they help us out in every day life. Satellites help us to know what the world looks like. They also help us to travel, prepare for good and bad weather.
they benefit the society

Answer 4

A satellite is built up of microscopic telescopes with cameras and mirrors. They have strong sight and can spot objects or different planets or stars from millions of miles away. They then collect the data and that data is sent through signals into a giant dish with antennas that send the data through wires and into the computers for astronomers or scientist to examine.

Answer 5

How - they are built from metals, ceramics and carbon materials. Why - for weather information, national security, as telescopes (Astronomers can see better outside of the atmosphere), for telecommunications {no satellite, no texting.} You can do things on a satellite that cannot be done inside Earth's atmosphere.

Answer 6

Satellites orbit a central mass of some sort as a result of gravity. Complex orbits can be the result of multiple gravitational sources.

The planets in a solar system can be considered satellites of the central star (or stars).

The moons orbit the planets they are near.

Normally staellites are by convention smaller then the objects they orbit.

A note: Not all orbits of satellites are stable and most orbits decay over time. The moon around Earth will someday either go zipping off or come crashing down at some point.

Many artificial satellites periodically use on-board systems to maintain their orbit and occasionally alter their orbit to avoid debris and on rare occassions and a rare number of sattelites, shelter themselves on the far side of a planet to protect against "bad solar weather."

Answer 7

There are a number of different reasons.

The first few satellites were sent up just to see if it could be done. The first few Sputnik satellites did nothing other than send radio beeps, and the first few Vanguard birds did little more.

Then there were weather satellites, and then communications birds, and then some navigation satellites. Now there are several THOUSAND active satellites in orbit, with dozens of varied purposes.

Answer 8

different satellites have different purposes. Communication, scientific study and research, etc

Answer 9

Wireless Internet accessible from the farthest places on Earth, courtesy of Elon Musk.

Answer 10

For many reasons some being meteorology, communications, geographic mapping, spying, entertainment, and scientific studies of Earth and space.