An atom is so tiny that two billion would fit on the dot on the top of the ' i '
Measurements:
1000 pico-meters = 1 nano meter
1000 nano-meters= 1 micro meter
1000 micro meters = 1 mm
10 mm = 1cm
100 cm = 1 meter
1000 meter = 1 km
9,460,000 million km = 1 light year
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