essential question what if there was no moon? objectives students will be able to: describe...
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Essential QuestionWhat if there was no moon?
ObjectivesStudents will be able to:
Describe formation theories of the moonDescribe how the moon affects tides
Identify the phases of the moonProvide the mechanism for eclipses
Differentiate between solar and lunar eclipses
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Where did the moon come from? There are three theories of the
moon’s formation: Capture Theory Simultaneous Formation Theory Impact Theory
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Capture Theory
Moon caught by Earth’s gravitational pull
Problems: What slowed the Moon? Why are the compositions so similar?
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Simultaneous Formation Theory
Moon and Earth formed at same general time in same general area
Problem: Why does Earth
have so much more iron?
Why doesn’t the moon have water like the Earth?
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Impact Theory
Earth collided with a Mars-sized object
Materials from collision came together to form moon
Explosion evaporated water
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How does the How does the Moon affect us?Moon affect us?
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Tides
Periodic rise and fall of the level of the ocean
The moon’s gravity pulls on Earth
Gravity creates build up of ocean water on both near and far sides of the Earth
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The ocean water build up stays in line with the moon
The ocean level rises and falls every 12 hours
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Tidal range – vertical distance between low and high tide
1- 2 m on East Coast of North America
Bay of Fundy – 20 meters
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Semidiurnal Tide 2 high tides and 2 low tides in 24 hours
Diurnal Tide one high tide and one low tide in 24 hours
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The Sun’s EffectSpring Tide – When
the sun and moon are aligned and the tides are HIGHER than normal
Neap Tide – When the moon and sun are at right angles and the tides are LOWER than normal
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Sun vs. Moon Does the Sun or the Moon have a larger
effect on tides?
THE MOON!!
*Even though the moon is smaller than the Sun, the moon is much closer to the Earth, and therefore has a larger effect on the tides.
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Phases of the MoonWhat if there was no moon?
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What causes the moon’s phases? The moon does not emit visible light The moon is visible due to reflected
sunlight One side (1/2) of the moon is always
lit As the moon rotates around Earth,
the light reflected by the moon changes, causing phases
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Phase Names
Gibbous Crescent Quarter moon Full Moon New Moon
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Waxing Vs. Waning
Waxing Increase in visible, sunlit portion of the
moon “Right” side of moon is visible
Waning Decrease in visible, sunlit portion of the
moon “Left” side of the moon is visible
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Phase Names
Waxing Crescent First Quarter Waxing Gibbous Full Moon Waning Gibbous Third Quarter Waning Crescent
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Eclipses
What if there was no moon?
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Eclipses
One object moves into the shadow of another
Named for the celestial body that is blocked
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Lunar Eclipse
Moon passes into Earth’s shadow
Reflected light from the moon is blocked, instead moon seems red
Can only occur during full moon
Occur slightly more frequently than solar
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Solar Eclipse
Moon passes between Earth and Sun Only see outer layers of sun Occurs during new moon
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Regions of Solar Eclipse
Umbra Area does not receive sunlight, total
eclipse Penumbra
Receives partial sunlight, partial eclipse
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Why don’t we have monthly eclipses?
The moon’s orbit is tilted compared to Earth
Eclipses only occur when orbits line up