In a vacuum, light travels about 3,725,648 miles every 20 seconds. In scientific notation this distance is expressed as: 3.725648 x 106 miles per 20 seconds.
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It is: 9.5*10^12 km in scientific notation
The number given in scientific notation is: 3.0*108
1 light year = 9.46*1015 metres.
There are only 31,536,000 seconds in a year. So, light can only travel for 31,536,000 in a year.
speed of light = 3.0 x 108 m/s