Forty years ago today, on November 26, 1985 (October 15, 1985 in the lunar calendar), the US space shuttle "Atlantis" took off. On November 26th, 1985, the American space shuttle "Atlantis" was launched from Kennedy Space Center in Florida and began its second space flight. It will conduct the skeleton construction test of a large space building for the first time, and gain experience for the United States to build a permanent manned space station in the early 1990s. During the scheduled seven-day flight, Atlantis will also launch three communication satellites and conduct a series of scientific experiments. Among the seven crew members of Atlantis, two astronauts will each conduct two 12-hour spacewalks during the flight. In the open cargo hold of the space shuttle about 320 kilometers above the ground, they will try to build two types of aluminum structures for space buildings: one is a 13.7-meter-long truss composed of more than 100 beams and struts; The other is a tetrahedral structure with an inverted "pyramid" shape 3.65 meters long on each side. In a state of weightlessness, the two astronauts will adopt fixed and "floating" postures respectively, and repeatedly dismantle these two building structures, so as to test what happens when people build large buildings in space, compare and gain experience. During the flight, the astronauts of Atlantis will experiment with Chinese acupuncture and moxibustion to treat "space disease", and stimulate the human acupuncture points said to be related to "space disease" by DC shock to observe the curative effect. They will also conduct photographic exploration in some arid areas in Africa to find groundwater sources; Growth of organic crystals in experimental weightlessness and fabrication of high-quality mirrors; And the development of drugs for treating anemia. "Atlantis" will launch three communication satellites for a company in Mexico, Australia and the United States in the first three days after entering space. "Atlantis" was launched at night, the second time in 23 flights of the American space shuttle so far. When it dragged its 200-meter-long orange-red fire tail and rose slowly from the launch pad, there was a spectacular scene, which could be seen for hundreds of miles. The crew of Atlantis includes Mexico's first astronaut Rudolph Nari and a female astronaut from the United States. The commander is Brewster-Shaw. The space shuttle is scheduled to land on Dec. 3 at Edwards Air Force Base in California.