* Nano (n) means one billionth (1/1,000,000,000)

* Kilo (k) means one thousand (1,000)

Conversion:

1. There are 1,000,000,000 nanometers in 1 meter.

2. There are 1,000 meters in 1 kilometer.

Calculations:

* 5 nanometers * (1 meter / 1,000,000,000 nanometers) = 5 x 10^-9 meters

* 5 x 10^-9 meters * (1 kilometer / 1,000 meters) = 5 x 10^-12 kilometers

Therefore, there are 5 x 10^-12 kilometers in 5 nanometers.