1. Planets and the Solar System

2. There are perhaps thousands of galaxies in the universe.

3. Galaxies contain • planets • moons • comets • meteors • asteroids

4. All these objects spin or orbit around a center star, our sun.

5. sun

6. Solar flare

7. Our galaxy, the Milky Way, orbits around the sun.

8. 3 main galaxy shapes • elliptical • irregular • spiral

9. elliptical galaxy

12. irregular galaxy

15. spiral galaxy

20. The Milky Way is a spiral galaxy.

21. There are thousands of galaxies, other than ours, in the universe. Some are very likely able to support life.

24. There are eight known planets.

26. The planets are divided into two main groups: inner and outer

27. inner planets • Mercury • Venus • Earth • Mars

28. Mercury

29. Venus

30. Venus

31. Venus

32. Venus fires

37. Mars

39. Mars

40. Mars

41. Olympia Mont on Mars Olympia Mont on Mars

42. Ice found on Mars!

43. The inner planets are smaller and made of rock and iron.

44. outer planets • Jupiter • Saturn • Uranus • Neptune

45. Shoemaker-Levy comet pieces that hit Jupiter

46. Shoemaker-Levy comet strikes (time lapsed)

47. Jupiter’s Big Red Spot

48. Jupiter

49. Jupiter and moons

50. Look how small the moon Io is compared to Jupiter. Our moon is 1/4 our size!