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The first human-made object launched into orbit was the Soviet satellite Sputnik 1, which was successfully launched on October 4, 1957. Weighing about 58 kilograms, Sputnik 1 marked the beginning of the space age and initiated the space race between the United States and the Soviet Union. Its transmission of radio signals back to Earth provided valuable data about the upper atmosphere and sparked a wave of interest in space exploration.

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