REUSABLE SPACECRAFT

Booster rockets-such as the Sarurn V that launched the Apollo astronauts toward the Moon-are extremely wasteful. They can fly only once, parts are thrown away after use, and 97 percent of the mass is consumed in the first few minutes. Clearly, what was really needed for advanced and economic space exploitation was a spacecraft that could take off and return, to be reused time after time.    In 1972 NASA in the United States decided to build the Space Shunle. Rockets were to be used to assist the launch. Crew facilities were to be provided for up to eight people, and the huge cargo bay would be used to take satellites and sections of the International Space Station (iss) into orbit. New instruments would also be taken up to existing spacecraFt, and in-orbit J repairs would be carried out.

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