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28 Cards in this Set
- Front
- Back
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What is the moon?
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The moon is the earth’s only natural satellite. It reflects the sun’s light.
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The moon is much ___________________ than the earth. The diameter is ____________ than the width of the USA.
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Smaller
Less |
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What is the diameter of the earth?
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Diameter = 2,159 miles
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The moon is almost a perfect ___________. Why?
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Because of its slow rotation, the moon is nearly a perfect sphere.
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The gravity on the moon is ______ of the gravity on the earth.
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1/6
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Unlike the earth, the moon has almost no atmosphere. Why?
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It’s week gravity can not hold one.
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The moon is covered with thousands of ____________________.
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craters
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What caused craters ?
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Meteoroids and asteroids
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Some craters have _______ branching out from them probably blown out from an explosion.
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rays
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There are large dark areas called__________.
HINT: These areas are sometimes called “seas” |
maria
(Singular = Mare) |
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The moon also has high mountains
And narrow valleys called _______. |
rills
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For the size of our planet our moon is _______.
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huge
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The average distance between the center of the earth and the center of the moon is____________________.
(don't forget a label) |
239,000 miles
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The moon’s revolution around the earth and its rotation
require the _________ _________. This keeps the same side, or face of the moon toward the earth. |
same time
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The side of the moon facing away from the earth is called the __________ side of the moon.
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far
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The side that faces away from the sun is called the ______side.
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dark
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From our reference point on earth, it appears to take ___________________ for the moon to revolve once around the earth.
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29 1/2 days
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When the moon appears to be “growing” we say it is __________.
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waxing
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When the moon appears to be “shrinking” we say it is ___________________.
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waning
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When the moon is directly between the earth and the sun a __________ _________ will occur.
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solar eclipse
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When the earth’s shadow covers the moon it is called a ___________ __________________.
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lunar eclipse
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Early rockets were First used by the Chinese in the 13th century. What were they used for?
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rockets
weapons |
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When does the Space Race begin.
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1957
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What is the purpose for satellites?
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Weather
Navigation (GPS) Communications Scientific research |
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Types of orbit
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polar
geostationary |
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Mercury Program _________ man.
Who? |
(one man)
Alan Shepard - into space and back - 1961 John Glenn - orbited the earth - 1962 |
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Gemini Program__________ men.
Who? |
(two men) Edward White - first space walk - 1965
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Apollo Program ________ men.
Who? |
(to the moon)
Neil Armstrong/Edwin (Buzz) Aldrin - 1st to walk on the moon Michael Collins orbits moon in command module - 1969 (Apollo 11) |
