4.2 km4.2 \mathrm{~km}4.2 km
8.85 km8.85 \mathrm{~km}8.85 km
17.70 km17.70 \mathrm{~km}17.70 km
8.85×1011 km8.85 \times 10^{11} \mathrm{~km}8.85×1011 km