lightnanosecond 1 foot 30 cm
lightmicrosecond 1,000 foot 300 m
lightmillisecond 186 miles 300 km
lightsecond 186,000 miles 300,000 km
lightminute 11 million miles 18 million km
lighthour 670 million miles 1 billion km
lightyear 6 trillion miles 10 trillion km
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