Using scientific notation, it is found that the measure of one astronomical unit in kilometers is
A number in <em>scientific notation</em> is given by:
In which
To realize the conversion from decimal to scientific notation, b is the number of decimal places the comma moves, being positive if to the left, negative if to the right.
In this problem, 1 AU = 150,000,000 km.
The comma has to move 8 places to the right, hence