To do so, we need the following ** conversion factors**:

**1 penny = 1.0 mm**

**1 mm = 10 ^{-3} m**

A penny has a thickness of approximately 1.0 mm.

If you stacked Avogadros number of pennies one on top of the other on Earths surface, how far would the stack extend (in kilometers)? [For comparison, the sun is about 150 million km from Earth and the nearest star (Proxima Centauri) is about 40 trillion km from Earth.]

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