Question

Sirius is about 8.8 light years from Earth. If one light year equals 9.46 × 10^12 kilometers, how far is Sirius from Earth, measured in kilometers?A. 1.1 × 10^11 kilometersB. 8.3 × 10^11 kilometersC. 1.1 × 10^13 kilometersD. 8.3 × 10^13 kilometers

Answer 1

Given:

The distance between the earth and Sirius is 8.8 light-years.

Also,

$1\text{ light year = 9.46 }\times10^{12}\text{ km}$

To find the distance between the earth and the Sirius in kilometres

Explanation:

The distance between the earth and the Sirius is

$\begin{gathered} d=\text{ 8.8}\times9.46\times10^{-12}\text{ km} \\ =8.3\times10^{13}\text{ km} \end{gathered}$

Thus, option D is correct.