The volunteers are given scale models of the moon and Earth. They must guess the distance between the two and then work out how to find out the correct answer. They use the moon in the sky to find the distance between their two models.
Professor Stephen Hawking challenges a selection of volunteers to think like the greatest geniuses in history and solve some of humanity's most enduring questions. Airs Wednesdays, May 18 - June 1, 2016, with two back-to-back episodes starting at 9/8c.
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