2. Moons of the solar system, as of October,2011 Planet Number of Moons Mercury0 Venus0 Earth1 Mars2 Jupiter60 Saturn31 Uranus27 Neptune13 Pluto1

3. Earth’s Moon

4. Possible Origin (theories)......  Formed Apx. 4.6 billion years ago.  Collision between a Earth and Mars-size object.  Impacts create the geologic features we see today.

5. Geology ……  Mares (seas) - lava filled basins or low lands on the moon…..(darker regions).  Highlands – rimmed portions of the craters or mountainous areas….(lighter regions).

6. Phases….  Phases – daily change in appearance.  This occurs for 2 reasons; Moon is seen by reflected light… Moon is seen by reflected light… Moon is in orbit around the Earth… Moon is in orbit around the Earth… NOTE – It takes the moon 27.3 days to revolve around the Earth.

7. Phases diagram..

8.  Waxing = when the moon goes from New to Full.  Waning = when the moon goes from Full to New.

9. What does the moon do?  Tides The moon is responsible for the Tides – Daily rise and fall of sea level (NOT WAVES). The moon is responsible for the Tides – Daily rise and fall of sea level (NOT WAVES).

10. Tides cont……  High tide to Low tide = 6hrs, 12 min, 30 sec.  Tidal Range – difference between High and low tide.

11. Shadows……..  Umbra- total shadow..  Penumbra – partial shadow…..  Types of eclipses……

12. Lunar eclipse - occurs when the moon is full and passes in the Earth’s shadow…..

13. Solar eclipse - occurs when the moon is new, and the Earth passes through the moons shadow……. NOTE: Must be at perigee…..