On this day, 66 years ago, on January 2, 1959 (November 23, 1958, the world's first lunar probe entered orbit around the sun. Luna-1 On January 2, 1959, the world's first lunar probe "Luna-1" launched by the former Soviet Union flew past the moon and entered orbit around the sun. Luna-1 (Russian: §­§å§ß§Ú §Ó-1) was the first interstellar probe successfully launched by the Soviet Union and by humans. It is the first member of a series of probes named after the Luna. On January 2, 1959, Luna 1 was successfully launched from the Baikonur Cosmodrome of the Soviet Union and immediately left Earth orbit. This makes it the first successful launch of a spacecraft to escape Earth's gravitational field. On January 4, 1959, Luna 1 passed by the Moon from 5995 km away. Luna 1's ultimate fate was to become the first artificial planet to orbit the sun forever, with a 450-day cycle. Since the 1950s, with the advancement of human science and technology, especially the development of aerospace technology, countries around the world have continued to increase their exploration activities on the moon. According to statistics, since 1958, a total of 127 lunar exploration activities have been carried out in the world. In the early days of lunar exploration, the Soviet Union was ahead of other countries. On January 2, 1959, the Luna-1 probe launched by the Soviet Union achieved the first time a human probe flew over the moon. On September 12, 1959, the Soviet Union launched the Luna-2 probe and hit the moon, becoming the first man-made object to reach the moon. In the next ten years, the Soviet Union launched 22 lunar exploration satellites, some of which reached the moon and conducted photography, measurement, sampling and field inspections, revealing the true face of the moon. In addition, the Soviet Union also launched other types of lunar probes. For example, in September 1968, an unmanned spacecraft flew around the moon for the first time and successfully returned to Earth. According to statistics, from 1958 to 1976, the Soviet Union launched a total of 64 detectors to the moon. In order to realize the lunar landing plan, the Soviet Union designed the N1 giant rocket and tested it four times, all of which ended in failure. After the United States successfully landed on the moon, the Soviet Union's moon landing program was cancelled in 1976.