1. Chapter 28 – Sun-Earth-Moon System
Space, the final frontier...
-Cpt. James T. Kirk-
USS Enterprise

2. 28.1 Tools of Astronomy
OBJECTIVES
Describe electromagnetic radiation.
-Explain Spectrum
Explain how telescopes work.
-what types are there?
-what makes them different?
Describe space exploration.
-Who and when?
-What countries?
Describe moon features
-ejecta, mare, albedo…

3. 28.1 Electromagnetic spectrum
The arrangement of waves that includes gamma rays, X rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves according to wavelength and frequency is called the electromagnetic spectrum.

4. 28.1 Refracting Telescopes
The telescope that uses lenses to bring visible light to a focus is a refracting telescope.

5. 28.1 Reflecting Telescopes
Telescopes that uses mirrors to bring visible light to a focus

6. 28.1 Interferometry
Interferometry is the process of linking many separate telescopes together to act as one

7. 28.1 Satellites
Telescopes are placed above the atmosphere in order to most effectively collect infrared and ultraviolet radiation, X-rays, and gamma rays.
Hubble Space Telescope

8. 28.1 Mars Probe (unpublished)

9. Cell phones, PCs, flat screen TV are a few examples of this.
28.1 Space spinoff
Cell phones, PCs, flat screen TV are a few examples of this.

10. 28.2 The Moon
OBJECTIVES
Describe the development of exploration of the Moon
Identify features on the Moon.
Explain the theories about how Moon was created.

11. Space Race
Yuri Gagarin was the first man in space.

12. Project Mercury launched the first American into space on May 5, 1960.
Alan Shepard was the first American man in space.
Project Mercury launched the first American into space on May 5, 1960.

13. Project Gemini
Project Gemini launched a two-person spacecraft into orbit in 1965.

14. Project Apollo
The space exploration program that landed astronauts on the Moon was Apollo.
Apollo Missions

15. July 20, 1969
Neil Armstrong was the first man to step foot on the Moon.

16. Moon’s Features
The Moon’s surface is very different from the surface of Earth because the Moon has no erosion.

17. Ejecta
Ejecta is the material blasted out of the Moon’s surface as a result of space-object impacts.

18. Mare
Dark, smooth plains on the Moon's surface (Maria, pl.)

19. The portion of sunlight reflected by the Moon’s surface.
Albedo
The portion of sunlight reflected by the Moon’s surface.
(actually from any satellite or planet that cannot produce its own light)

20. Rilles
Valley-like structures on the Moon's surface

21. Synchronous Rotation
The Moon's state, in which its rotational and orbital periods are equal

22. Simultaneous formation theory
The theory that suggests the Moon was formed at about the same time as Earth and from similar materials is called the simultaneous formation theory.

23. 28.3 The Sun-Earth-Moon System
OBJECTIVES
Identify the relative positions and motions of Earth, the Sun , and the Moon.
Describe the phases of the moon.
Explain eclipses of the Sun and Moon.

24. Earth’s Rotation
The daily rising and setting of heavenly objects like the Sun is caused by the rotation of Earth.

25. Our timekeeping system is based on the solar day.

26. Foucault pendulum
Hanging-weight system that helps demonstrate the rotation of Earth

27. Plane of the Earth's orbit about the Sun called the ecliptic

28. Earth’s Tilt
Different seasons occur because of Earth’s tilt and Earth’s orbital motion around the Sun.
Net effect:
Seasons!

29. Solstice
Earth’s position near or on December 21, at which the northern hemisphere has its minimum daylight hours
Earth’s position around June 21, at which the northern hemisphere has its maximum daylight hours

30. Equinox
‘Vernal’
Earth’s position when the lengths of day and night are equal
‘Autumnal’

31. Apogee vs. perigee
Perigee - Closest point to Earth in the Moon’s orbit
Apogee - Farthest point from Earth in the Moon’s orbit

32. Lunar Phases
The sequential changes in the appearance of the Moon are called lunar phases.
Sun

33. Waxing
When the Moon waxes during its lunar cycle, the amount of its sunlight portion that we see appears to increase in size.

34. When 2 full moons occur in the same calendar month..
“Blue Moon”
When 2 full moons occur in the same calendar month..
Year
Month
First Full Moon
Blue Moon
2009
December
2nd at 07:29
31st at 19:11
Year
Month
First Full Moon
Blue Moon
2012
August
2nd at 03:25
31st at 13:56

35. Can only occur during the phase of the full moon.
Lunar Eclipse
A lunar eclipse occurs when the Moon passes through Earth's shadow.
Can only occur during the phase of the full moon.

36. Solar Eclipse
Occurs when the Moon passes directly between the Sun and Earth (Solar eclipses can only occur at time of New Moon)

37. Eclipses - Why not every month?
The orbit of the Moon is tilted 5° relative to the ecliptic plane of the Earth-Sun. ie. Most months its shadow passes north or south of the Earth.