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41 Cards in this Set

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How many miles away is the Moon from Earth?
238,866 miles
Why does the same side of the moon always face earth? Why?
The Moon spins on its axis at the same rate that it revolves around the earth, because the gravity pulls the heavier side which keeps it facing the same way
What are 2 factors that cause the phases of the moon?
1. position of the sun, earth, and moon
2. light from the sun reflects off the moon, the moon does not create its own light
How long does it take for a moon to have 1 full rotation?
29.5 days
What is the order of the phases?
New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Waning Crescent, New Moon
What causes night and day?
Rotation of the Earth on its axis
What causes seasons?
Earth revolves around the sun clockwise, the tilt of the axis (23.5º)
What is a solstice? When are the dates of the solstices?
when the earth is most tilted toward or away from the sun, Summer Solstice- June 20-22 (longest day of the year), Winter Solstice- December 20-22 (shortest day of the year)
What is an Equinox? When are the dates of the equinoxes?
the sun is directly over the earths equator; not tilted towards or away from sun, Vernal- March 20-22, Autumnal- September 20-22
What is the circumference of the earth?
Circumference- 40,074 kilometers or 24,903 miles
What is the period rotation of the earth?
23 hours, 56 minutes
What is the rate of its spin?
1669.75 km/hr or 1040- mi/hr
Why do we use the phrase "The Dark side of the moon"?
Only one side of the moon faces the earth- the side we see (illuminated), we don't see the other half so it is called the DArk side of the moon
What is an eclipse?
when one object (earth or moon) casts a shadow on another
what kinds of eclipses are there?
Solar, Lunar
What is a solar eclipse?
moon casts a shadow on the earth
What is a lunar eclipse?
earth casts a shadow on the moon; moon is directly behind Earth
What is a New Moon?
The Moon's unilluminated side is facing the Earth. The Moon is not visible (except during a solar eclipse).
What is a full moon?
the Moon's illuminated side is facing the Earth. The Moon looks like it’s completely illuminated by direct sunlight.
Where is the Moon located?
Inbetween the Sun and Earth
What is a tide?
changes in the ocean water levels and regular intervals
Where are high tides?
same side or opposite moon
Where are low tides?
90º from moon
What is the most accepted moon formation theory?
Collision (ejected ring theory)
What phases of the moon would you see during the day?
New Moon, crescent phases, half quarter moons
Because of the tides, how much is the earth rotation slowing every century?
Describe the shape of the earth
Almost spherical, wider around the equator
What latitude is 23.5º north of the equator?
Tropic of Cancer
How long does it take the earth to go around its axis?
23 hours, 56 minutes
How long does it take the earth to go one time around the sun?
365.25 days
How long does it take to complete one full moon phase cycle?
29.5 days
How much of the moon is always illuminated by the sun?
How long does it take the earth to go around the sun by the minute?
365 days, 5 hours, 48 minutes
Howlong does it take the moon to orbit once around the earth?
27.3 days
Give the month of the year of the last blue moon and the next blue moon
Next- June 2007, Last- July 2004
What 2 factors cause seasons?
tilt of the earth on its axis, earth orbiting the sun
What type of eclipse is this? (Sun, Moon, Earth)
What is a blue moon?
Second moon in the same month
what is the circumference of the earth?
a. 24,010 miles
What are the 4 main theories of moon formation-examples?
Ejected moon- most accepted
Fission- moon was once attached to earth
Capture- moon formed elsewhere
Condensation- formed out of the same nebula
Explain the alignment/position of the Earth, Moon, Sun during a spring tide, and why it causes maximum high tides?
New Moon or full moon- all pulling water in same direction