1. Convert millimeters to meters:
2,700,000,000 \text{ mm} \times \frac{1 \text{ m}}{1000 \text{ mm}} = 2,700,000 \text{ m}
2. Convert meters to kilometers:
2,700,000 \text{ m} \times \frac{1 \text{ km}}{1000 \text{ m}} = 2700 \text{ km}
Answer: 2700 \text{ km}