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Our Moon
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Our Moon
I. Formation
A. There have been a number of theories of how the Moon formed. The ___________ brought back by the _______ astronauts have narrowed number of theories that fit the data to one.
B. The Moon was formed when a _________ _____ collided with the early Earth. After the collision, the iron-nickel core of this planetesimal sank to the Earth’s center to become part of its core. The Moon is composed of material that is much like the Earth’s _______, which was ejected into space after the collision and then coalesced to form the Moon.
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Our Moon
I. Formation
A. There have been a number of theories of how the Moon formed. The _Moon rocks_ brought back by the _Apollo_ astronauts have narrowed number of theories that fit the data to one.
B. The Moon was formed when a _________ _____ collided with the early Earth. After the collision, the iron-nickel core of this planetesimal sank to the Earth’s center to become part of its core. The Moon is composed of material that is much like the Earth’s _______, which was ejected into space after the collision and then coalesced to form the Moon.
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Our Moon
I. Formation
A. There have been a number of theories of how the Moon formed. The _Moon rocks_ brought back by the _Apollo_ astronauts have narrowed number of theories that fit the data to one.
B. The Moon was formed when a _Mars-size body_ collided with the early Earth. After the collision, the iron-nickel core of this planetesimal sank to the Earth’s center to become part of its core. The Moon is composed of material that is much like the Earth’s _______, which was ejected into space after the collision and then coalesced to form the Moon.
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Our Moon
I. Formation
A. There have been a number of theories of how the Moon formed. The _Moon rocks_ brought back by the _Apollo_ astronauts have narrowed number of theories that fit the data to one.
B. The Moon was formed when a _Mars-size body_ collided with the early Earth. After the collision, the iron-nickel core of this planetesimal sank to the Earth’s center to become part of its core. The Moon is composed of material that is much like the Earth’s _mantle_, which was ejected into space after the collision and then coalesced to form the Moon.
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II. After The Collision
A. The Moon formed approximately _______ miles from Earth, much closer than the 239,000 miles from Earth it is today. The Earth’s rotation was also much faster with days being __________ long.
B. The close Moon caused the land to rise and fall _________ of feet every _________.
C. Because of these large tidal effects, the Moon ___________ from the Earth, quickly at first and then more slowly. Today the Moon is moving away from the Earth at a rate of __________. The Earth’s day has gotten longer, currently at a rate of 0.002 seconds per century.
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II. After The Collision
A. The Moon formed approximately _15,000_ miles from Earth, much closer than the 239,000 miles from Earth it is today. The Earth’s rotation was also much faster with days being _5-6 hours_ long.
B. The close Moon caused the land to rise and fall _________ of feet every _________.
C. Because of these large tidal effects, the Moon ___________ from the Earth, quickly at first and then more slowly. Today the Moon is moving away from the Earth at a rate of __________. The Earth’s day has gotten longer, currently at a rate of 0.002 seconds per century.
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II. After The Collision
A. The Moon formed approximately _15,000_ miles from Earth, much closer than the 239,000 miles from Earth it is today. The Earth’s rotation was also much faster with days being _5-6 hours_ long.
B. The close Moon caused the land to rise and fall _hundreds_ of feet every _few hours_.
C. Because of these large tidal effects, the Moon ___________ from the Earth, quickly at first and then more slowly. Today the Moon is moving away from the Earth at a rate of __________. The Earth’s day has gotten longer, currently at a rate of 0.002 seconds per century.
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II. After The Collision
A. The Moon formed approximately _15,000_ miles from Earth, much closer than the 239,000 miles from Earth it is today. The Earth’s rotation was also much faster with days being _5-6 hours_ long.
B. The close Moon caused the land to rise and fall _hundreds_ of feet every _few hours_.
C. Because of these large tidal effects, the Moon _moved_away_ from the Earth, quickly at first and then more slowly. Today the Moon is moving away from the Earth at a rate of __________. The Earth’s day has gotten longer, currently at a rate of 0.002 seconds per century.
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II. After The Collision
A. The Moon formed approximately _15,000_ miles from Earth, much closer than the 239,000 miles from Earth it is today. The Earth’s rotation was also much faster with days being _5-6 hours_ long.
B. The close Moon caused the land to rise and fall _hundreds_ of feet every _few hours_.
C. Because of these large tidal effects, the Moon _moved_away_ from the Earth, quickly at first and then more slowly. Today the Moon is moving away from the Earth at a rate of _3.8 cm/yr_. The Earth’s day has gotten longer, currently at a rate of 0.002 seconds per century.
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III. Other Facts
A. The Moon has a synchronous orbit, which means its rotational period is equal to its _______ period. As a result, the Moon keeps one side facing the Earth at all times.
B. The Moon’s age is primarily determined by ________________. Uranium-238 decays with a half-life of 4.5 billion years.
C. Our Moon is the ____ largest Moon in the solar system. A large Moon helps to keep the tilt of Earth’s axis stable.
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III. Other Facts
A. The Moon has a synchronous orbit, which means its rotational period is equal to its _orbital_ period. As a result, the Moon keeps one side facing the Earth at all times.
B. The Moon’s age is primarily determined by ________________. Uranium-238 decays with a half-life of 4.5 billion years.
C. Our Moon is the ____ largest Moon in the solar system. A large Moon helps to keep the tilt of Earth’s axis stable.
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III. Other Facts
A. The Moon has a synchronous orbit, which means its rotational period is equal to its _orbital_ period. As a result, the Moon keeps one side facing the Earth at all times.
B. The Moon’s age is primarily determined by _radioactive dating_. Uranium-238 decays with a half-life of 4.5 billion years.
C. Our Moon is the ____ largest Moon in the solar system. A large Moon helps to keep the tilt of Earth’s axis stable.
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III. Other Facts
A. The Moon has a synchronous orbit, which means its rotational period is equal to its _orbital_ period. As a result, the Moon keeps one side facing the Earth at all times.
B. The Moon’s age is primarily determined by _radioactive dating_. Uranium-238 decays with a half-life of 4.5 billion years.
C. Our Moon is the _5th_ largest Moon in the solar system. A large Moon helps to keep the tilt of Earth’s axis stable.
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IV. Tides
A. On average, the Earth’s surface rises and falls ___________ twice each day.
B. Tidal Effect (Gravitational Force)
From an outsider’s perspective From Earth’s perspective
Earth Moon Earth Moon
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IV. Tides
A. On average, the Earth’s surface rises and falls _30 cm (1 ft)_ twice each day.
B. Tidal Effect (Gravitational Force)
From an outsider’s perspective From Earth’s perspective
Earth Moon Earth Moon
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IV. Tides
A. On average, the Earth’s surface rises and falls _30 cm (1 ft)_ twice each day.
B. Tidal Effect (Gravitational Force)
From an outsider’s perspective From Earth’s perspective
Earth Moon Earth Moon
smaller bigger
pointed towards Moon’s center
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IV. Tides
A. On average, the Earth’s surface rises and falls _30 cm (1 ft)_ twice each day.
B. Tidal Effect (Gravitational Force)
From an outsider’s perspective From Earth’s perspective
Earth Moon Earth Moon
smaller bigger
pointed towards Moon’s center
squeezed
stretched
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IV. Tides (cont’d)
A. The Result
Earth Moon
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IV. Tides (cont’d)
A. The Result
Non-rotating Earth
Earth Moon
watersqueezing
stretching
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IV. Tides (cont’d)
A. The Result
Non-rotating Earth
Rotating Earth
Earth Moon
water
The high tide runs ahead of the Moon. Water takes time
to rise to its maximum height.