For many reasons some being meteorology, communications, geographic mapping, spying, entertainment, and scientific studies of Earth and space.
Orbiting Earth satellites have several uses. One is the simple exploration of the conditions of space and how Earth activities would be different there. The lack of gravity provides for unique studies of biological and chemical reactions. Another is the lack of atmospheric interference, which improves astronomical observation and measurement of other space phenomena. The vantage point of an orbiting satellite likewise offers an excellent observation of the Earth, with a wide variety of cameras, radar, and other instruments. This allows monitoring of geologic and weather activity. Suitable locations in near-Earth space provide communications relay locations for radio, television, phone, and data transmissions.
Go to wikipedia (http://en.wikipedia.org/)
Type in "Satellite"
Look in the table of contents for "types"
Scroll down to that section, you will see a list.
it can search the physical problems on the earth
A single satellite can only give you relative location. 3 satellites can give a 2-D positioning/location that includes longitude and latitude. 4 satellites can give a 3-D positioning/location that includes longitude, latitude and altitude. Only 4 satellites can give you absolute location.
There are no known satellites of Mercury.
Triangulation of satellites requires three satellites that bank of one another simultaneously.
Yes but they are called natural satellites
Satellites are in space not in countries.
We don't need to protect our satellites because their is not yet warfare in space where our satellites are.
triangulation
The aliens need to use earth's satellites so that they can coordinate their invasion efforts.
100 and there is life on uranus... go check
so we can keep our satellites running
You need 4 to locate a position. There are 24 satellites in use in the sky with 8 spares.
i dont know i think its that it is big
No. GPS Satellites are free to receive.
At leAst 3
No as GPS is obtained from satellites.
For an unconstrained solution, you need 4 satellites in view to get a GPS fix. If you know one variable, such as altitude (on a ship, for instance) you can do it with 3.
Satellites need to be self contained for their energy supply. There are a limited number of options. These are * Battery power * Fuel Cells * Solar Power * Nuclear Power