1. ASTRONOMY

2. Big Bang Theory Occurred about 13.7 billion years ago

3. Nebular Hypothesis
The Sun, Earth and
solar system formed
about 4.6 billion years
ago from a cloud
of dust in space

4. Scale of the Universe
Galaxies in
the universe

5. Scale of the Universe Our galaxy: the Milky Way Spiral-shaped
A collection of
millions of stars
Our Sun is
one of them!

6. Scale of the Universe
Our Solar system

7. Create Your FOLDABLE
Cut along The dotted lines. You Should end up with 7 strips that are 2 inches wide each.

8. Axis

9. Reason for the Seasons

10. Rotation

11. Earth’s Circumference
Earth is wider around the Equator as a result of its rotation.

12. Revolution (Orbit)

13. Ellipse

14. Precession

16. Nutation

18. Barycenter

20. Johannes Kepler
3 Laws of Planetary Motion

21. Galileo Galilei
Contributions:

22. Sir Isaac Newton
Laws of Gravity 1. 2.

23. Lunar Phases (Sizes are NOT to Scale)

24. Lunar Phases

25. Solar Eclipse
Makes no sense without caption in book

26. Lunar Eclipse
Makes no sense without caption in book

27. High and Low Tides
We experience tides due to the gravitational pull of the Moon and the Sun. As Earth rotates, a coastal location will experience two high tides and two low tides daily. Tides will change about every 6 hours.

28. Tides

29. Spring and Neap Tides
Spring Tides occur when the Earth, Moon and Sun are aligned.
High tides are higher and low tides are lower than normal. (More extreme!)
Occurs during Full and New moon phases
Neap Tides occur when the Earth, Moon and Sun are at right angles to each other
Tides don’t change as much throughout the day
Occurs during 1st and 3rd Quarter moon phases

30. Earth’s Moon Lunar History
 The most widely accepted model for the origin of the moon is that when the solar system was forming, a body the size of Mars impacted Earth. The resulting debris was ejected into space, began orbiting around Earth, and eventually united to form the moon.

31. Formation of Earth’s Moon
Makes no sense without caption in book

32. The Sun-an average star
The Sun’s Energy
The Sun-an average star
• Nuclear fusion is the way that the sun produces energy. This reaction fuses small hydrogen atoms together to become a larger helium atom, releasing a tremendous amount of energy.
• It is thought that a star the size of the sun can exist in its present stable state for 10 billion years. As the sun is already 4.5 billion years old, it is “middle-aged.”

33. Nuclear Fusion
Makes no sense without caption in book