Crewed Spacecraft Missions.

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Only by using fuel.
Without engines operating, any spacecraft (or object) is in "free fall" - it's path is controlled by the gravity of other bodies.

If that path is an orbit and outside atmosphere, it may be a stable situation, but it's then not stationary.
Likewise if it is in a Lagrange point of another body in orbit.

Otherwise it is accelerating towards whatever body or bodies have the most gravitational influence.
 
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