Rocket

Launch of Apollo 15 to the Moon.

A rocket may be a missile, spacecraft, aircraft or other vehicle which is pushed by a rocket engine. Some big rockets are launch vehicles and some are manned (e.g. Saturn V). Other rockets, for example missiles, are unmanned. ("Manned" means that a person is in it; "unmanned" means that the machine goes without a person.)

Most rockets can be launched from the ground because exhaust thrust from the engine is bigger than the weight of the vehicle on Earth. Some are used to bring satellites into orbit, for example from a spaceport. Some rockets such as ion thrusters are too weak and heavy to lift themselves. They work after other rockets bring them to outer space.

The rocket was invented by the Chinese, using gunpowder. The first rockets were shaped like arrows and were not very fast. Most rockets still work by fire. The fire makes hot exhaust gases that expand and shoot out a nozzle. This makes the rocket go forward.

Most rockets still use solid fuel to make the fire. The biggest ones use liquid fuel because it makes a hotter fire so the rocket is more powerful. However, handling the liquid fuel safely is difficult and expensive. Some satellite launch vehicles use both.

Rockets are also used for fireworks and weapons and to control moves in outer space.

Manned rockets, similar to other manned flying machines, are designed to limit their acceleration and vibration to protect the crew. Unmanned rockets however are not bound by the limits of humans.

Some rockets go faster than the speed of sound (Mach 1 or 1,200 km/h; 760 mph). Those that go into Low Earth orbit go 30,000 km/h (19,000 mph).

Yuri Gagarin was a Soviet cosmonaut who, on 12 April 1961, became the first human to fly into outer space. He was in the R-7 rocket launched by the Soviet Union.

Pioneers

• Konstantin Tsiolkovsky
• Robert H. Goddard
• Wernher von Braun
• Hellmuth Walter

Rocket Media

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  A Soyuz-FG rocket launches from "Gagarin's Start" (Site 1/5), Baikonur Cosmodrome

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  Rocket arrows depicted in the Huolongjing: "fire arrow", "dragon-shaped arrow frame", and a "complete fire arrow"

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  Mysorean rockets and rocket artillery used to defeat an East India Company battalion during the Battle of Guntur

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  William Congreve at the bombardment of Copenhagen (1807) during the Napoleonic Wars

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  Robert Goddard with a liquid oxygen-gasoline rocket (1926)

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  A battery of Soviet Katyusha rocket launchers fires at German forces during the Battle of Stalingrad, 6 October 1942

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  V-2 rocket launched from Test Stand VII, summer of 1943

• Launch of Apollo 15 Saturn V rocket: T − 30 s through T + 40 s

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  Viking 5C rocket engine

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  Nuclear gas core closed cycle rocket engine diagram, nuclear "light bulb"

• Video of the launch of Space Shuttle Endeavour on STS-134