1 terameter is 1e+21 nanometers.
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1,000,000,000,000,000,000 (1018) nanometers (nm) are in 1 gigameter (Gm)
There are 1 000 000 000 meters in 1 Gm.
1 meter=1.0x10^-9 gigameters
There are 1,000,000 nanometers in a millimeter.
1 nanometer = 1.0 × 10-9 meters