Well depends..
If you're saying that the speed of light is 3x10^8 m/s then 1 light year is 9.46728x10^15 metres
If the speed of light is exact (299,792,458m/s) then 1 light year would be 9,460,730,472,580,800 metres (9.46073x10^15)
Not much difference...
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light-year
A light year.
9.461*1012 km
One light year is approximately equal to seven trillion miles. So, 23 million light years is approximately equal to 161 quintillion miles. In scientific notation, that is 1.61 x 1020 miles.
A light year is a measure of distance, not time. A light year is the distance that light will travel in one year. One light second is 186,000 miles. A light year is a measure of distance, not time. A light year is the distance that light will travel in one year. One light second is 186,000 miles.