SatellitesA satellite is defined as an object that orbits or revolves around another object. In basic terms, this relationship is due to the gravitational pull of the larger object while the smaller one has enough speed and momentum to go around the larger one (Fitzgerald & Dennis). This is a good definition if you are just talking about the general principles of why and how objects attract each other and where this occurs in nature. The billions of stars and planets together constitute a vast network of orbiting objects that can rightly be called satellites. By studying how the Universe and Solar System work, scientists have been able to send artificial devices into Earth orbit to meet the needs of a technologically developing world. We have benefited our world by using satellite technology to carry out tasks and provide a range of innovative services. The main applications of satellites concern the fields of communications, terrestrial remote sensing, weather and scientific research. In some ways the use of satellites has made our world smaller. Satellites make it possible to establish a connection between two people at opposite ends of the globe through a phone call or the use of the Internet. Each of these satellites is made up of many parts, but two parts common to all satellites are called the payload and bus. These groups of devices make the satellite capable of carrying out its tasks. An example of a communications satellite is EchoStar 3. It is used to send TV signals to homes in North America. Due to this simple use of television broadcasting through these technical machines, today there are more than one hundred communications satellites orbiting the earth. Communications satellites are also used as relay stations in space. People use them to bounce messages from one part of the world to another. These messages can be phone calls, television images, or even Internet connections. Many communications satellites have footprints. Communications satellites like EchoStar 3 are in a geosynchronous orbit. This means that the satellite always remains above a point on Earth. The area of ​​Earth it can see is called the satellite's footprint. For example, a footprint that covers all of Africa can be used by one person to send a message to another person in Africa. Communications satellites could also be used as relay stations to send messages to people via a system of satellites with many footprints.