On this day, 67 years ago, January 4, 1958 (November 15, 1957, the first artificial satellite returned to Earth. The Soviet Union launched the world's first artificial satellite Sputnik. On October 4, 1957, the Soviet Union launched the world's first artificial satellite Sputnik. The satellite roamed in space for 92 days and returned to Earth on January 4, 1958. During its fall into the atmosphere, the satellite burned up. The Sputnik was proposed and built by Korolov, the father of the Soviet space industry. The satellite weighs 83 kilograms and orbits the earth for about 98 minutes. The successful launch of Sputnik has brought new developments to the political, military, technological and scientific fields, and also marked the dawn of the human space era. The satellite is made of chrome-plated alloy, weighs 83.6 kilograms, has a spherical appearance, a diameter of 58 centimeters, an orbit apogee of 986.96 kilometers, and a perigee of 230.09 kilometers. It orbits the earth every 96 minutes. The satellite carries two radio transmitters. Through four antennas placed on the satellite's surface, the transmitters continuously transmit the simplest signals to the ground. Many radio enthusiasts around the world received this signal from outer space at that time. The first artificial earth satellite spent 92 days and nights in low-earth orbit, orbiting the earth 1400 times, and a total range of 60 million kilometers. On January 31, 1958, the United States successfully launched the first "Explorer"-1 artificial satellite; on April 24, 1970, China successfully launched the first artificial satellite "Dongfanghong"-1.