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Toby and Frank 10E
The evolution of the satellite is long and complicated. As we know, Russia is the first country which can launch satellite. Russia orbited the first artificial satellite--Sputnik 1, it launched by the Soviet Union on October 4 in 1957. After one month, Sputnik 2 was launched, but this launch was quite different, it carried the first living passenger, a dog named Laika. In the USA, the first satellite is Explorer 1, it launched on January 31, 1958. And on April 24, 1970, China launched the first artificial earth satellite named Dong Fang Hong 1. After that, China became the fifth country which can launch the satellite independently. And the largest artificial satellite orbiting the earth is the International Space Station, it launched in 1998, on November 20.
For society :
GPS now is very popular around the world, it is a mid-range circular orbit satellite navigation system. It provides accurate positioning, speed and high-precision time standards for most areas of the Earth’s surface.
It is used for precise timing, engineering construction, exploration and mapping, weapons navigation, vehicle navigation and so on. Today, GPS devices are popular in vehicle anti-theft systems. It enhances the safety of society and improves people's lives.
For culture :
Satellite technology has promoted cultural exchanges between country and country. From the 1960s to the present, each country send talents to study around the world, in this process, these people communicate with other students who are from different countries, they know about different civilization each other.
Human activities are not only leaving wastes on the Earth, but also polluting space. Space debris has posed a great concern in the countries which pursue space exploration.The average speed of space debris is 10 km per second and the maximum speed can be 16 km per second. Explosion or disassembly could happen if the craft is hit by a large piece of space debris. So far, three disastrous collisions have occurred, according to Gong. Even a 10-gram piece of debris can generate a collision force in space equaling to the crash of a car running at 100 km per hour, said Du Heng, chief scientist with China's space debris action program. On the average, a space shuttle has to reinstall 1.41 windows after each flight, according to the National Aeronautics and Space Administration of the United States. In July 1999, 64 collision traces were found on the American space shuttle "Discovery" after it returned to the Earth. Most debris float in a zone 300 to 2,000 km from the Earth, where most space activities are carried out, and the number of debris larger than 10 cm is increasing by 200 each year. Therefore, some scientists warn that if not controlled, the quantity of space debris will rise twice in 100 years, and no space vehicles can exist in space in a few centuries. Most these rubbish are from the artificial satellites, after the satellites stop working, we have no idea to clean them, as time passes, these satellites become the space junk. The satellite takes a bad influence to the environment.
Satellite navigation, satellite communication and Earth observation produce information that can support public managers in a number of strategic sectors, such as transport, environmental monitoring, risk management, urban planning, and tale-medicine, to quote but a few. The field of satellites provides a good job for many tech professionals.
http://www.spacesafetymagazine.com/space-debris/astrophotography/view-keyhole-satellite/is launch was quite different, it carried the first living passenger, a dog named Laika. In the USA, the first satellite is Explorer 1, it launched on January 31, 1958. And on April 24, 1970, China launched the first artificial earth satellite named Dong Fang Hong 1. After that, China became the fifth country which can launch the satellite independently. And the largest artificial satellite orbiting the earth is the International Space Station, it launched in 1998, on November 20.