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S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...

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S.3 Need of <strong>Propulsion</strong><br />

<strong>Propulsion</strong> is needed <strong>to</strong>:<br />

- 3-<br />

Place payloads in<strong>to</strong> orbit: launch propulsion is used;<br />

Send payloads <strong>to</strong> the moon or <strong>to</strong> the planets: space propulsion is used;<br />

Position, adjust and maintain orbits of spacecrafts by orbit control: auxiliary propulsion<br />

is used;<br />

Orient spacecraft by attitude control: auxiliary propulsion also called reaction-control<br />

systems is used.

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