3. Size and Scale of the Universe - Review

4. Solar System Review The rocky planets are closest to the Sun. The rocky planets are smaller than the gas giants.

5. Solar System Review The rocky planets have fewer moons (0 to 2). The rocky planets’ days are long (24 hours to 243 days).

6. Solar System Review The rocky planets’ years are short (88 days to two years).

7. Solar System Review The gas giants are farthest from the Sun. The gas giants are larger than the rocky planets.

8. Solar System Review The gas giants have many moons (17 to 63). The gas giants’ days are shorter (10 hours to 17 hours).

9. Solar System Review The gas giants’ years are long (12 years to 165 years).

10. From Smallest to Largest Earth Sun

11. From Smallest to Largest Solar System

12. From Smallest to Largest Milky Way Galaxy

13. From Smallest to Largest Local Group

14. From Smallest to Largest Virgo Supercluster

15. From Smallest to Largest Universe

16. What is a light year? The distance light travels in one year. It is 6,000,000,000,000 miles.

17. What is a light year? Why do we use the light year? Because distances in space are so large.

18. Didja ya know? Space is mostly empty space. The Solar System, Milky Way, all the galaxies combined are very, very,very small compared to the universe.

19. Can we travel to another star? No!

20. Because distances in space are so large.