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Write about What, is satellites and write few information about satellites
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Answer:
A satellite doesn't necessarily have to be a tin can spinning through space. The word "satellite" is more general than that: it means a smaller, space-based object moving in a loop (an orbit) around a larger object. The Moon is a natural satellite of Earth, for example, because gravity locks it in orbit around our planet. The tin cans we think of as satellites are actually artificial (human-built) satellites that move in precisely calculated paths, circular or elliptical (oval), at various distances from Earth, usually well outside its atmosphere.
The Space Shuttle launching a communications satellite from its payload bay.
We put satellites in space to overcome the various limitations of Earth's geography—it helps us step outside our Earth-bound lives. If you want to make a phone call from the North Pole, you can fire a signal into space and back down again, using a communications satellite as a mirror to bounce the signal back to Earth and its destination. If you want to survey crops or ocean temperatures, you could do it from a plane, but a satellite can capture more data more quickly because it's higher up and further away. Similarly, if you want to drive somewhere you've never been before, you could study maps or ask random strangers for directions, or you could use signals from satellites to guide you instead. Satellites, in short, help us live within Earth's limits precisely because they themselves sit outside them.
We tend to group satellites either according to the jobs they do or the orbits they follow. These two things are, however, very closely related, because the job a satellite does usually determines both how far away from Earth it needs to be, how fast it has to move, and the orbit it has to follow. The three main uses of satellites are:
Communications
Communications satellites are essentially used to relay radio waves from one place on Earth to another, catching signals that fire up to them from a ground station (an Earth-based satellite dish), amplifying them so they have enough strength to continue (and modifying them in other ways), and then bouncing them back down to a second ground station somewhere else. Those signals can carry anything radio signals can carry on the ground, from telephone calls and Internet data to radio and TV broadcasts. Communications satellites essentially overcome the problem of sending radio waves, which shoot in straight lines, around our curved planet—intercontinental signals, in other words. They're also useful for communicating to and from remote areas where ordinary wired or wireless communications can't reach. Calling with a traditional landline (wired phone), you need a very convoluted network of wires and exchanges to make a complete physical circuit all the way from the sender to the receiver; with a cellphone, you can communicate anywhere you can get a signal, but you and the receiver both still need to be within range of cellphone masts; however, with a satellite phone, you can be on top of Mount Everest or deep in the Amazon jungle. You're entirely free from any kind of telecommunications "infrastructure," which gives you geographic freedom and an instant ability to communicate (you don't have to wait for someone to string up telephone lines or set up cellphone masts).
Explanation:
Satellites are man-made objects orbiting the Earth and other planets in the solar system. It is different from natural satellites, or moons, that orbit planets, dwarf planets and even asteroids. Satellites are used to study the Earth, other planets, so that they can contact us, and also see the distant universe. Satellites may also have those, such as the International Space Station and Space Shuttle.
The first Satellite was the Soviet Sputnik 1 mission launched in 1957. Since then, many countries have launched satellites, with more than 3,000 currently operating spacecraft around the Earth. The space is estimated to contain over 8,000 pieces of junk; Dead satellites or pieces of debris going around the earth.
The satellites are launched in various orbits depending on their mission. One of the most common is geosynchronous orbit. This is where a satellite takes 24 hours to orbit the Earth.
The same amount of time it takes the Earth to rotate on its axis once. This satellite stays in one place on Earth, allowing for communications and television broadcasts.