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Week 6: Planets galore: the contents of the Milky Way

Completion requirements

This figure shows the time it takes for light to cover various distances in the Galaxy. Note the distances are not drawn to scale – you would need a really big screen if it were! If the distance from the Earth to the Moon is represented by 1 cm on your screen, your screen would need to be about 13 million km wide to show the distance across the Milky Way Galaxy to scale!