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# Long description

The image shows six circles of various sizes running from top to bottom. The uppermost one is the largest, and the circles become ever smaller running to the lowermost one which is the smallest. The largest circle is labelled as magnitude 1, the next is labelled magnitude 2, and so on to the smallest which is labelled as magnitude 6. On the left of the image is text which reads ‘each about 2.5 times dimmer than the previous magnitude star’. Down the right side of the image the second star is labelled as times 2.5, the third star as times 6.25, the fourth star as times 16, the fifth star as times 40 and the sixth star as times 100. On the right of the image is text which reads ‘cumulative reduction in brightness compared to magnitude 1 star’.