Can gyroscope work in zero gravity? Most ships have two or more gyroscopes to balance on water, man made satellites uses gyroscope for orientation as they fall around earth. All these applications seems to be associated with gravity, therefore how can a gyroscope works in zero gravity?
 A: Gyroscopes depend on the conservation of angular momentum.  Orientation and navigation gyroscopes are finely balanced/symmetrized so that gravitational fields will not exert external torque and modify the angular momentum.
As the container which holds the gyroscope moves, a gimbal mount allows the gyroscope to maintain a constant rotational axis orientation.  Sensors measure the changes between the container and the axis of rotation so that navigation parameters are known.
Even if there was no gravitational field, the angular momentum (and hence the orientation of the axis) would be constant.
A: 
man made satellites uses gyroscope for orientation as they fall around
  earth. All these applications seem to be associated with gravity,
  therefore how can a gyroscope work in zero gravity?

You are probably confusing or identifying the property of a gyroscope with the phenomenon of precession
The bicycle wheel (gyroscope) doesn't fall down and precesses because the force of gravity is deviated from the vertical axis to the horizontal one. What you see is gravity pushing the wheel around instead of pushing it downward.
But this happens because of the property of a gyroscope to oppose any change in the plane of rotation and shift it by 90°
This property is univerally valid and works in any conditions and also in zero gravity.
You can see here what happens in a spacecraft at zero gravity. The gyroscope does not rotate on its center of mass when is hit/pushed on one tip. You can see that, when it's not spinning, it rotates, exactly like on earth.
The only difference is that, if you hang it on one tip, it will stand still, it will not precess because no force is acting on it in any direction
A: A gyroscope rotor does not possess the property of weight in zero gravity, but the rotor still possesses the property of mass and the associated properties of inertia, and, (when in circular motion), angular velocity and momentum so the gyroscopic principles of conservation of angular momentum fully apply and so the gyroscope performs exactly as it would in a gravity field, i.e. it maintains a stable directional orientation of its axis of rotation.
The only difference is that in a gravity field, (where there is no nett angular component of force on the rotor's axis), the gyroscope body (i.e. the closed system), as a whole would fall towards the centre of the distortion of the space-time continuum whilst maintaining its axial orientation.
In a zero gravity environment, the closed system would simply float and, in the absence of any unbalanced external influencing force, would maintain its axial orientation as explained above.
https://www.youtube.com/watch?v=xQb-N486mA4
A: When a gyroscope is outside of a gravity field, the spinning disc has no weight. To my mind this means that no centrafugal force or any other force is produced so there is no effect. If you had a gyroscope on earth with no flywheel it would be the same thing, would that work !!
