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1 light year = 9.4605284 × 1015 meters
A light-year is about 9.46 x 1015 meters.
The speed of light in vacuum is:186,282 miles per second.299,792,458 meters per second.
The speed of air at 20 degrees Celsius is 343 meters per second. The speed of light is 299 792 458 meters per second.
In a second, light travels about 300,000 km., or 3x108 meters.