It is written this way:
Five trillion eight hundred seventy-eight billion six hundred twenty-five million three hundred seventy-three thousand one hundred eighty-three and six hundred eight thousandths miles.
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one billion light years = 5.87849981 × 1021 miles
A light year is a measure of distance, not time. A light year is the distance light travels in one year. In one day light travels 16,081,407,123 miles.
miles... in kph??? Anyway, the speed of light is 300,000 kilometers/second; you can convert that to whatever unit you want. For example, to convert to kilometers/hour, multiply by 3600.
the equation for how many miles light travels in one year
How many hours does it take to get to 4.5 billion km