Stars and the Universe — practice question

Earth lies $6.6 \times 10^{20}\,\text{m}$ away from the galaxy Draco II. What is this distance in light-years?

• A$1.4 \times 10^{4}$ light-years
• B$6.9 \times 10^{4}$ light-years
• C$1.4 \times 10^{6}$ light-years
• D$6.9 \times 10^{6}$ light-years