They're having some trouble nailing down the diameter of a proton. It's somewhere around 8.5 x 10^-16 meters.
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A proton is 2x10^-14m, or 0.00000000000002m
The diameter of a grain of sand is 0.0025. In scientific notation, this is written as 2.5 x 10^-3
The Diameter of Mercury is 4,880 Kilometers.
0.000007 meters in Scientific Notation = 7 x 10-6meters.
It is: 9.4*108