Light-year is the unit for measuring the distance of celestial bodies, and 1 light-year is about 9.5 trillion kilometers. The nearest star to the earth is about 4.22 light-years, which is how many trillions of kilometers.
光年是计量天体距离的单位，1光年约9.5万亿千米．距地球最近的一颗恒星约有4.22光年，合多少万亿千米．
<gadget id="calculator">4.22 * 9.5</gadget>
<output>40.09</output>

<result>40.09</result>