Ajay asked his father that pole star is the only star in the sky that does not move as night passes. Which could be the best reason explaining this?

Its gravitational force is very large

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It is located in the direction of the axis of earth

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Because pole star is too large to move

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All of these

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Solution

The correct option is B
It is located in the direction of the axis of earth

Stars appear moving because of earth's rotation. But pole star is located in direction of Earth's axis. So there is no effect of rotation on the angle of vision between earth and the pole star. Hence it does not move as night passes.

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