1。AVIATION WEEK SPACE TECHNOLGY 《航空技术周刊》2、AIR FORCE MAGAZINE 《空军杂志》3、AIR INTERNATIONAL 《国际航空》(注;飞行器杂志)4、CANADIAN AERONAUTICS SPACE JOURNAL 《加拿大航空期刊》5、FLIGHT INTERNATIONAL
1 The birth of the universe Observed universe, its borders are about more than 100 million light-years. It consists of a large number of galaxies. Earth is an ordinary planet in the solar system, while