1. Earth “The home planet”

2. Earth: Home We know more about this planet than any other planet. We use this information to help us determine what might be happening on other planets, in other solar systems.

3. 3 rd from the sun, Average of 1 AU, or 149,600,000 km 12,756 km in diameter 5 th largest planet

4. Densest major body in the SS Too many spacecrafts and satellites have studied the earth to list them all

5. Rotation Period: 23 hrs 56 min Orbit Period: 365.24 ED Average Temp: 14 C

8. Perfect setting for life as we know it! 71% of surface is covered with water 77% N, 21% O AND a TINY, TINY, TINY % of CO 2

9. Relatively young surface: After about 500,000,000 years erosion and tectonics tend to erase features, making much of earth’s history a mystery. Greenhouse gases raise the average global temperature from -21 C (what it would be without the gases) to a comfortable 14 C

10. Free oxygen is a result of biological processes. Free oxygen: critical for you and me!

11. Earth, from 240,000 miles while Apollo 8 orbits the moon. One natural satellite(The Moon) and thousands of artificial ones

12. Last shot of the Earth from Voyager