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Question

To which star do the following properties belong?
(a) It lies close to the axis of rotation of Earth.
(b) It is one of the brightest star in the sky
(c) All stars appear to revolve around it.
(d) It may not be visible from some points in the southern hemisphere.

A
Sirius
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B
Alpha Centauri
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C
Pole star
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D
Regal
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Solution

The correct option is D Pole star
Pole star lies close to the axis of rotation of the Earth. Hence it does not appear to move. However, since Earth rotates from West to East, all the other heavenly objects appear to be moving in the opposite direction, i.e., from East to West since the pole star also appears to be fixated in one place, it seems like the other stars revolve around it. It is one of the brightest star in the sky and can be seen almost every night. However, it cannot be seen from some points in the Southern hemisphere.

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