Indian rocket scientists claim to have designed a reusable space plane, dubbed Avatar, which they plan to use for launching satellites at very extremely low cost and taking tourists on rides into space The Times of India has reported. According to the report, the critical feature of Avatar is that it does not carry any liquid oxygen at take off. Instead, the entire 21 tonnes of liquid oxygen required for the rocket flight will be produced during an initial hour long cruise through the atmosphere – where at eight times the speed of sound, Avatar will suck in air before separating the oxygen and liquifying it for storage.