Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Scientists have now invented the rocket-powered airliners! The new rocket-powered aircraft has proved to travel from the United Kingdom to Australia in more or less than 4 hours. The new air-breathing rocket engine is named as SABRE. The new rocket engine is found to use jet turbine as well as the latest rocket technologies. Moreover, SABRE possesses an innovative pre-cooler technology which has as aim to cool the incoming airstream from over 1,000°C to minus 150°C in less than 1/100th of a second (six times faster than the blink of an eye) without blocking with frost. The recent tests have proven the cooling technology to be frost-free at the crucial low temperature of -150°C. SABRE has the potential to accelerate an aircraft to Mach 5.5 - 7242 km/h at sea level and more than five times the speed of sound...