A penny is described as a coin having thickness of about 0.019 m as follows:
[tex]Thickness of a penny = 0.019 m[/tex]
[tex]Number of pennies stacked is equivalent to Avogadro number = 6.02 * 10^23 penny[/tex]
[tex]Distance convered by number of pennies = 6.02 * 10^23 * 0.019 = 1.14 * 10^19 Km[/tex]
[tex]Thus the stack of pennies extended upto 1.14 * 10^19 Km[/tex]