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.
![](spacediag15.png)
(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
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