Benefits of Satellite ?

Question

Hi ppl,

I wish to know the answers for any of the following questions.

1.What is the meaning of word satellite?
2.what is the use of Satellite?
3.So for how many satelites had been sent from earth?
4.In which orbit usually Satellite revolves?
5.As soon as the rocket is launched from earth where it will land?

Many thanks

Answer 1

Well here u go arul..

1. A satellite is an object that moves around a larger object. Earth is a satellite because it moves around the sun. The moon is a satellite because it moves around Earth. Earth and the moon are called natural satellites.

But usually when someone says "satellite," they

are talking about a "man-made" satellite. Man

made satellites are machines made by people.

These machines are launched into space and

orbit Earth or another body in space.

2. Satellites fly high in the sky, so they can see large areas of Earth at one time. Satellites also have a clear view of space. That's because they fly abov Earth's clouds and air.

Before satellites, TV signals didn't go very far. TV signals only travel in straight lines. So they would go off into space instead of following Earth's curve. Sometimes they would be blocked by mountains or tall buildings.

Phone calls to faraway places were also a

problem. It costs a lot and it is hard to set up

telephone wires over long distances or

underwater. wit satellites, TV signals and phone calls can be sent up to a satellite. The satellite can then send them back down to different spots on Earth.

3. According

to the United States Space Surveillance Network, there are more than 21,000 objects larger than 10 cm orbiting the Earth. Just a small fraction of these are operational satellites. It’s estimated there are a further 500,000 bits and pieces between 1 and 10 cm in size mr. arul..

4. Near Earth orbit is so polluted with junk that the international Space Station is often moved to avoid impact with dangerous chunks of space debris. Many of these objects are created through collisions, and some scientists are worried that future space travel might be too risky if we get

too much junk orbiting the planet. We might seal ourselves inside a shield of shrieking metal moving at 29,000 km/hour.

Looking outwards from our own orbit, at any time there are a handful of satellites orbiting the

Moon. Right now, NASA’s Lunar Reconnaissance orbiter and Lunar Atmosphere and Dust

Environment Explorer are in lunar orbit. Further

still, there’s 1 spacecraft around Mercury, 1 at

Venus, 3 visiting Mars and 1 orbiting Saturn.

There’s a handful of spacecraft orbiting the Sun, although they’re leading or trailing the Earth in its orbit. And a few spacecraft are on trajectories to

take them out of the Solar System entirely.

NASA’s Voyager spacecraft, exited the Sun’s

heliosphere in 2013, and entered the interstellar

medium.

5. As far i know it depends the scientist team mate.. When launching a spacecraft to orbit, a

"dogleg" is a guided, powered turn during

ascent phase that causes a rocket's flight path

to deviate from a "straight" path. A dogleg is

necessary if the desired launch azimuth, to

reach a desired orbital inclination, would take

the ground track over land (or over a

populated area, e.g. Russia usually does

launch over land, but over unpopulated areas),

or if the rocket is trying to reach an orbital

plane that does not reach the latitude of the

launch site. Doglegs are undesirable due to

extra onboard fuel required, causing heavier

load, and a reduction of vehicle performance, hope i hav helped u.. cheers.

Answer 2

If you are talking about man made satellites they are artificial objects placed into an orbit by humans.

They are mainly used to broadcast television and other signals around the world. The main use is the GPS (Global Positioning System), and this is used in Sat-Navs.

Because we usually use the satellites they usually revolve around the Earth, and to be more precise if you have a television broadcasting satellite then it will reside in the geostationary orbit (moves in sync with earth = completes one revolution in 24 hours). Cheaper ones will just reside in an orbit close to earth.

and when the Satellite is placed into orbit by a rocket the rocket will then either land back to earth or if it is a cheaper operation they'll land it into the sea, where they take it and either scrap it or use it again.

Answer 3

1. a satellite is an object that orbits around the planet. the Moon is a natural satellite of the planet Earth. for various purposes and then man made artificial planet.

2. the satellite is used for various purposes, such as for research, as telescopes, remote sensing, telecommunications, data transfer, as a spy tool, to detect any changes in the weather, and weapons

3. thousands

4. a satellite can remain above one point on earth around the Equator then should be placed at a height of 22,237 miles (geostationary orbit)

5. usually the rockets already planned that would fall in the ocean

Answer 4

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 the Moon

Satellites are manmade objects put into orbit. They often affect our lives without our realizing it: they make us safer, provide modern conveniences, and broadcast entertainment



Television

Satellites send television signals directly to homes, but they also are the backbone of cable and network TV. These satellites send signals from a central station that generates programming to smaller stations that send the signals locally via cables or the airwaves. "At the scene" news broadcasts, whether live reporting on a vote at the Capitol or from the scene of a traffic accident, are sent from the field to the studio via satellite, too.



Telephones

Satellites provide in-flight phone communications on airplanes, and are often the main conduit of voice communication for rural areas and areas where phone lines are damaged after a disaster. Satellites also provide the primary timing source for cell phones and pagers. In 1998, a satellite failure demonstrated this dependence; it temporarily silenced 80 percent of the pagers in the United States,



Navigation

Satellite-based navigation systems like the Navstar Global Positioning Systems (known colloquially as GPS) enable anyone with a handheld receiver to determine her location to within a few meters. GPS locators are increasingly included in in-car direction services and allow car-share services like Zipcar to locate their cars.

refer 2 wiki list of indian satellites, list of USA satellites u vil get list

man-made satellites circle the Earth in many ways including polar and geostationary orbits.



* Polar orbit:



The satellite in a polar orbit travels over the North and South Poles. A polar orbit may be from several hundred miles to several thousand miles above Earth. This type of satellite circles the Earth approximately 14 times each day. Because the Earth is turning more slowly than the satellite, the satellite gets a slightly different view on every revolution. Over the course of a few days, a satellite in a polar orbit will cover almost all the planet.



* Geostationary orbit:



The satellite in a high-altitude, geostationary orbit circles the earth once every 24 hours, the same amount of time it takes for the Earth to spin on its axis. The satellite turns eastward (like our Earth) along the Equator. It stays above the same point on Earth all the time. To maintain the same rotational period as the Earth, a satellite in geostationary orbit must be 22,237 miles above the Earth. At this distance, the satellite can view a huge portion of the Earth's surface. Because the high-altitude satellite appears to remain fixed in one position (it's really orbiting at the same rate as the Earth turns),

Answer 5

I fully agree with Mr Reece but like to add that there are many other uses of satellites like weather forecast,fore warning of storms keeping an eye on vast universe of any potential danger to earth, to spot and stop dangerous missiles and meteorites etc before those hit the earth, telecommunications. Innumerable uses so to say.