Labels:text | screenshot OCR: ROCKET POWER SPACE TECHNOLOGY Many rockets, including the US Space Shuttle's main rocket engines, use liquid hydrogen as the fuel and liquid oxygen as the oxidizer. Liquid- propellant rockets are more frequently used than those that use solid propellants because their flow of propellant, and therefore the thrust of the engines, can be controlled when necessary. The rockets do have their disadvantages, however, since some propellants must be stored at very low temperatures. This is because at atmospheric temperatures, the liquids evaporate to become gases, which take up more space than liquids. Large rockets such as the European THE EXTERNAL TANK Space Agency's Ariane or NASA's Space Shuttles The external tank from the usually have several liquid-propellant rocket Shuttle Atlantis falls bac ...
