Are artificial satellites permanent like our moon?
Answers
Artificial satellites are also destroyed by comets, asteroids, etc. And some satellites are destroyed when their part are disturbed and their metals corrods. So, They are not permanent.
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The idea of an artificial satellite in orbital flight was first suggested by Sir Isaac Newton in his book Philosophiae Naturalis Principia Mathematica (1687). He pointed out that a cannonball shot at a sufficient velocity from atop a mountain in a direction parallel to the horizon would go all the way around Earth before falling. Although the object would tend to fall toward Earth’s surface because of gravitational force, its momentum would cause it to descend along a curved path. Greater velocity would put it into a stable orbit, like that of the Moon, or direct it away from Earth altogether.
On October 4, 1957, nearly three centuries after Newton had proposed his theory, the Soviet Union launched the first Earth satellite, Sputnik 1. Sputnik circled Earth every 96 minutes, and its simple radio signal was heard by scientists and radio operators across the world. The United States orbited its first satellite, Explorer 1, three months later (January 31, 1958). Explorer, though much smaller than Sputnik, was instrumented to detect radiation and discovered the innermost of the two Van Allen radiation belts, a zone of electrically charged solar particles that surrounds Earth.
Since these initial efforts, more than 5,000 Earth satellites have been orbited by more than 70 different nations. As of 2017, more than 2,000 satellites are in orbit, the majority being from Russia or the United States. The satellites vary widely in size and design, ranging from small “picosatellites” of less than a kilogram to the International Space Station, a space laboratory that is home to six astronauts and has a mass of more than 400 tons. They are equally diverse in function. Scientific satellites are chiefly used to collect data about Earth’s surface and atmosphere and to make astronomical observations. Weather satellites transmit photographs of cloud patterns and measurements of other meteorological conditions that aid in weather forecasting, while communications satellites relay telephone calls, radio and television programs, and data communications between distant parts of the world. Navigation satellites enable the crews of oceangoing vessels and airplanes to determine the position of their craft in all kinds of weather. Some satellites have distinctly military applications, such as reconnaissance and surveillance.