[填空题]
A light-year is the distance light travels in one ywpe rzggax job5yf/ 98f5(6-n)+ wpxrn/-u*q vjl3eaear (at speed = $2.998 \times 10^8 \; m$). (a) How many meters are there in 1.00 light-year? $\times 10^{15}$ (b) An astronomical unit (AU) is the average distance from the Sun to Earth, $1.50 \times 10^8 \; km$. How many AU are there in 1.00 light-year? $\times 10^{4}$