A wonderful presentation about moon

2. Chapters 25 &26
Moon and Sun

3. Astronomy
Define Astronomy.
Astronomy is the study of the …
Universe

4. Origin of the Moon
4 Theories

5. Origin of the Moon
4 Theories
●Earth spinning so fast that a chunk spun off
into orbit
●Moon was formed elsewhere in the solar
system and captured by Earth’s gravity
●Earth and moon formed simultaneously
●Earth and a planet sized object collided,
debris from the impact pulled together to
form the moon

6. Origin of the Moon
Which is the
most accepted
theory on how
the moon was
formed?

7. Development of the Moon
Define meteoroid.
A meteoroid is a(n) …
Icy or rocky celestial body that travels
through space and can range in size from a
speck to an object weighing 1000’s of Kg

9. Earth's Moon
●Lunar history
● Hypothesis suggests that a giant asteroid
collided with Earth to produce the Moon
● Older areas have a higher density
● Younger areas are still smooth
● Moon evolved in three phases
● Original crust (highlands)
● As Moon formed, its outer shell melted,
cooled, solidified, and became the
highlands
● About 4.5 billion years old

10. Major topographic features
on the lunar surface

11. Earth's Moon
●Lunar surface
● Two types of terrain
● Maria (singular, Marem), Latin for "sea"
● Dark regions
● Fairly smooth lowlands
● Originated from asteroid impacts and lava
flooding the surface

12. Formation of lunar maria

13. Development of the Moon
Define crater.
A crater is a …
A depression in the moon’s surface created
by a meteoroid
Crater rim
Basin

14. Craters
●Most obvious features of the lunar surface
●Most are produced by an impact from a
meteoroid

15. A 20-kilometer-wide crater
on the Moon

16. Formation of a Crater

17. Astronomy
Misconception
Phases of the Moon are
caused by the shadow
of the Earth on the Moon
Phases of the Moon are
caused by our changing
view of the illuminated
side of the Moon
● ½ Moon is always illuminated
by the Sun

18. Synchronous Rotation
moon takes exactly the same amount of time to orbit Earth as it does to rotate
● no“dark side” of the Moon
●each location experiences about 14 days of daylight and 14 days of night.

19. Phases of the Moon

20. Motions of the Earth-Moon
system
●Eclipses
● Simply shadow effects that were first
understood by the early Greeks
● Two types of eclipses
● SSolar eclipse
● Moon moves in a line directly between Earth
and the Sun
● Can only occur during the new-Moon phase
● This is the only time when the outer layers
of the sun are visible

21. Solar eclipse

23. Motions of the Earth-Moon
system
●Eclipses
● Two types of eclipses
● Lunar Eclipse
● Moon moves within the shadow of Earth
● Only occurs during the full-Moon phase
● The usual number of eclipses is four per
year

24. Lunar eclipse

25. Lunar Eclipse

26. Solar eclipse