anMass toursm:An increase in mass tourism on the scale on the expansion during the 1950-1980 period is unlikely.Aircraft:A radical breakthrough in aviation technology could lead to the development of aircraft capable of entering the re-entering the Earth’s atmosphere. By orbiting at 300 kilometers above the Earth’s surface, the aircraft could be capable of flying between London and Sydney, Australia in a little over one hour.
đang được dịch, vui lòng đợi..