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Questions on the Earth in Space

Q15.

On a clear night, a camera was set up on a fixed stand pointing at the Pole Star. The camera shutter was opened and kept open for a number of hours. The diagram shows the paths of a number of stars appearing in the photograph.

(a)

(i) In the photograph, most of the stars appear as curved lines instead of dots. Why do the stars appear as curved lines?

1 mark

(ii) The Pole Star appears as a bright dot in the middle, not as a curved line. Why does the Pole Star appear as a dot?

1 mark

(b) Study the diagram carefully. For how many hours was the camera shutter kept open?

1 mark

Maximum 3 marks