Rocket
A missile or launch vehicle propelled by reaction, which carries both fuel and the oxygen to burn the fuel. Because of this, it can work in airless space. The fuel and oxidizer (oxygen-provider) are called the propellants. The Chinese are thought to have used rockets first some 750 years ego, employing gunpowder as a propellants. Most space launch vehicles,however, have liquid propellants. The largest successful rocket was the American Saturn V, 111m(365ft) long with a take off thrust of 3.4 million kg (7.5million lb), built for the Apollo Moon-landing missions.
Ariane rocket The heavy launch vehicle for the European space agency (ESA), which was first flight tested in 1979. Standing some 47.5m (155ft) high on the launch pad ,its first two stages burn hydrazine and nitrogen tetroxide as propellants, while the third stage burns liquid hydrogen/oxygen.
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