"The Sun-Earth-Moon System" hpt 2 Study Guide Flashcards

Terms Definitions
January
When is the Earth closet to the Sun
Umbra
A total solar eclipse can only be seen by people in the area of Earth within the Moon's ____________
When they are within the moon's umbra
When can someone see a total solar eclipse?
June
When does the summer solstice begin in the Northern Hemispere?
Northern hemispere
The summer solstice begins in June in the ___________
longer
Daylight hours are (longer/shorter) for the hemispere tilted toward the sun.
shorter
Daylight hours are (longer/shorter) for the hemispere that is tilted away from the sun.
by the earth's rotation on it's axis
What causes day and night?
day and night
________ and _____________ are caused by the Earth's rotation on it's axis.
ice may exist at the poles
What does the presence of hydrogen in crater rocks at the moon's poles mean?
The Clementine
This provided data for a detailed map of theMoon's surface.
a compass
What would you need to end up at the magnetic north pole of the Earth?
by studying moon quakes
How did scienctists defelop a model of the moon's interior structure?
moon quakes
By studying _______________________, scientist have been able to develop a model of the moon's interior structure.
impact theory
the moon formed from gas and debris thrown off Earth after a collision, according to _____________________________
That the moon formed from gas and debris thrown off earth after a collision.
What is the Impact Theory?
rotates; 24 hours
The earth ___________ on it's axis about once every ______________.
lunar; solar
People are more llikely to see a ____________ eclipse than a total _____________ eclipse
a lunar eclipse
Are you more likely to see a solar or lunar eclipse?
When the sun's position is directly over the Earth's equater.
When is Equinox reached?
sun's; equator
Equinox is reached when the ______________ position is directly over Earth's _________
half; lighted side
First quarter is the waxing moon phase in which ____________ of the moon's _________________ can be seen from earth.
When half of the moon's lighted side can be seen from earth
What is the waxing moon phase?
the first quarter
When is the waxing moon phase?
a hollow area formed on the moon by an object striking its surface.
What is impact basin?
impact basin
____________________ is a hollow area fromed on the moon by an object striking its surface.
lunar eclpse
When the earth's shadow falls on the moon we are seeing a _________________ ____________
When the earth's shadow falls on the moon
When do we see a lunar eclipse?
moon phases
The changing appearances of the moon as seen from earth are its _________ _______________
the changing appearances of the moon as seen from earth
What are moon phases?
ellipse
An elongated closed curvature is called a ______________
an elongated closed curve
What is an eclipse?
its yearly orbit around the sun
What is the earth's revolution?
The imaginary line around which a planet such as earth spins.
What is the axis?
solar eclipse
__________________________ occurs when the moon temporarily blocks the sunlight reaching earth.
When the moon temporarily blocks the sunlight from reaching earth
what is a solar eclipse?
rotation
The spinning of the earth on its axis is its ______________
A round, three-dimensional object whose surface is the same distance from it's center at all points
What is a sphere?
a sphere
A round , three dimensional object whose surface is the same distance from it's center at all points
When the moon is between Earth and the sun and cannont be seen
What is the New Moon?
the point at which the sun reaches its greatest distance north or south of the equator.
What is Solstice?
north or south of the equator
Solstice is the point at which the sun reaches its greatest distance__________________________________________
When the moons entire surface that faces earth is lit up
What is a full moon?
full moon
When the moon's entire surface that faces earth is lit p there is a _____________________
is when the amount fo the moon's lilghted side that can be seen becomes smaller
What is waning?
waning
___________________ is when the amount of the moon's lighted side that can be seen becomes smaller.
Maria
What are the flat regions of the moon called?
ellipse
The distance between the earth and the sun changes during the year because the sun is offset from its center since the earth's orbit is an _________________
when the number of daytime hours and nighttime hours are equal
What is an equinox?
no, it is the reflection from the sun
Does the moon really shine:
every 27.3 days
how often does the moon revolve around the earth
moon; earth
Every 27.3 days the ___________ revolves around the _________.
waning moon; half
Third quarter moon is the ______________ _____________phase in which ______________ of the lighted side of the moon can be seen from earth
The waxing moon phase is the first quarter moon and the moon will appear to grow over the from night to night. The waning phase is the third quarter moon and it becomes smaller from night to night.
what is the difference between the waxing moon phase and the waning moon phase?
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