What is the size of the Earth compared to the Sun?

Have you tried 'Playground planets'? This ELI models the relative sizes of the planets and their distances from the Sun. If the Earth is modelled as a sphere 6mm in diameter, how big is the Sun? (696mm) Using a scale of about 100 billion to 1, if the Earth is 1.5m from the Sun, how far is Neptune? (45m)
This activity can be used in any lesson about space and astronomy. It can also be used in mathematics for work on large numbers and scale.
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