Aviation refers to the navigation activities of manned or unmanned aircraft in the earth's atmosphere; spaceflight refers to the navigation activities of manned or unmanned spacecraft outside the earth's atmosphere, also known as space flight or space navigation. In order to expand social production, human beings must open up new space for activities. From the land to the ocean, from the ocean to the atmosphere, and then to the space, is such a human gradually expand the scope of activities of the process.
Aerospace is the product of human expansion of the atmosphere and space. After more than a hundred years of rapid development, aerospace has become one of the most active and influential fields of science and technology in the 21st century. The major achievements in this field mark the latest development of human civilization and the advanced level of science and technology in a country.