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If the spacecraft carries a crew, the spacecraft itself must be able to slow down and land safely on the earth.Overcoming gravity is the biggest problem in getting into space.The orbiter continues into space and releases the external tank just before entering orbit.Returning to the earth involves problems opposite to those of getting into space.

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Solid propellants are loaded into the rocket at the factory, and are then ready to use.

It consists of an orbiter, an external tank, and two solid rocket boosters. Propellants are fed to the engines from the external tank.

The external tank holds the propellant, which consists of liquid hydrogen and LOX.

A spacecraft may make several kinds of trips into space.

It may be launched into orbit around the earth, rocketed to the moon, or sent past a planet.

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