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Dong Fang Hong-1 Satellite

The first Dong Fang Hong-1 satellite（东方红一号） was independently developed by Chinese scientists and was launched on April 24, 1970. Its main tasks were to carry out satellite technology experiments, to explore the atmospheric density. The 173kg satellite adopted the spin-stabilized attitude control system and had a designed life expectancy of 3 years. The satellite broadcasted The East Is Red music at 20.009 Hz.

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