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When you have the scale relationship...

1 inch = 1 Astronomical Unit

you can also say...

1 mile = 1 lightyear

This may prove usefile for those of you who build scale models of our solar system.

If you pack the contents of all visible stars in the Milky Way Galaxy (about 100 billion) into one sphere, the diameter of the spere will only be about 30 Astronomical Units.

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