In a groundbreaking achievement, researchers from Waseda University and the Japan Aerospace Exploration Agency (JAXA) have successfully tested a Mach 5 ramjet engine, marking Japan’s first experimental combustion test of its kind. This innovative engine could revolutionize air travel, enabling flights from Japan to the US in just two hours, a feat that would redefine our understanding of intercontinental travel. The recent test simulated conditions akin to flying at Mach 5, reaching speeds of 5400 km/h at an altitude of 25 km.