one astronomical units is about 1.5 X 10 km .

Answer 1

An astronomical unit is a unit of length equal to about 149,597,8701 kilometres (92,955,807.3 mi) or approximately the mean Earth–Sun distance.

What is your question?

Answer 2

1 AU = 149,597,871 km

Answer 3

Assuming that what you want is the missing exponent:
One astronomical units is about
1.5 X 10^8 km