宇宙活動 / 社会・生活 / ハイテクノロジー
A return-trip space passenger plane developed for the era of mass space transportation as a replacement for the Space Shuttle. Takeoff is accomplished via an Air Turbo Ramjet engine, followed by acceleration to Mach 12 via a scramjet engine, after which the plane switches over to a rocket engine for space flight. There are currently 6 companies offering spaceplane flights to and from outer space. With the introduction of spaceplane flights, traveling into space has become a reality for the ordinary person. The most popular airlines are America's American Space Lines and Japan's Nippon Space Lines, based on their service, cost, and safety record.