In order to leave some time for delivering presents, this means Santa would need to travel at 5.1 million miles per hour (8.2 million kmph), or 0.8 per cent of the speed of light.
Dr Laura Nicole Driessen, a radio astronomer from the University of Sydney, made these festive calculations based on a formula created by particle physicists from Fermilab in the 1980s.
Writing for the Conversation, Dr Driessen says: 'We know Father Christmas only delivers presents to those who truly believe.'
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