1 light year = 9.46*1015 metres.
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It is: 9.5*10^12 km in scientific notation
9.461*1012 km
The number given in scientific notation is: 3.0*108
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.
In the same way as the scientific notation is used elsewhere. 1 light year, for example, is 9.4607*1015 metres. 1 Planck's distance equals 1.6162*10-35 metres.