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Letter: For the record – 13 July 2019

Published 10 July 2019

• The area in which ammonia was detected on Pluto is about 200 kilometres wide (8 June, p 18).

• Earth takes 23 hours 56 minutes to complete one rotation and Mars takes 24 hours 37 minutes (15 June, p 38).

Issue no. 3238 published 13 July 2019

Â鶹´«Ã½ issue 3238 cover

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