12. A light-year is a distance covered by light in a single year. This is equivalent to 5.88 trillion miles (9.5 trillion kilometres)! The width of the Milky Way is around 100,000 light-years.
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12. A light-year is a distance covered by light in a single year. This is equivalent to 5.88 trillion miles (9.5 trillion kilometres)! The width of the Milky Way is around 100,000 light-years.