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There are 1000000000000 picometres in one metre. Therefore, 200 picometres is equal to 200/1000000000000 = 0.0000000002 metres.
There are one billion nanometers in a kilometer. A nanometer is one billionth of a meter, and a kilometer is one thousand meters. So, 1 km = 1,000 m = 1,000,000,000 nm.
There are 1,000,000,000 gigameters in 1,000,000,000,000 micrometers.
The correct term is trillion for the number 1,000,000,000,000, which represents one thousand billion or one million million.
No, 1000000000000 meter sticks laid end to end would measure 1 trillion meters. The circumference of the Earth is approximately 40 million meters, so the meter sticks would be way too long to go around the world.