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25 Cards in this Set
- Front
- Back
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How big is the moon compared to the earth?
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30 times smaller than the earth's diameter
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The lack of an atmosphere......
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allows the moons's surface temperature to vary tremendously.
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What are the major surface features of the moon?
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Maria, highlands, and craters
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Who was the first to gaze at the moon?
When? |
Galileo
400 years ago |
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What are maria?
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are low, flat plains formed by ancient lunar lava flows.
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What are craters?
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are round depressions in the surface caused by the impact of high-speed meteoroids.
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What are meteoroids?
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are chunks of rock that move through the solar system.
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Where are most craters found?
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in the maria
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Scientists hypothesize that the moon.....
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formed after an enormous collision early in earth's history
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How can we see the surface of the moon?
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it's surface reflects light from the sun
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What are phases?
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the different shapes of the moon visible from earth
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The moon's phases are caused by changes ....
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in the releative positions of the moon, sun, and Earth as the moon revolves around the Earth.
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How long does it take for the moon to complete all its phases?
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29.5 days
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Can we see the entire surface of the moon from earth? Why?
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No, the moon rotates at the same rate it revolves.
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What is an eclipse?
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occurs when the shadow of one body in space such as a planet or moon falls on another
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A solar eclipse......
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occurs when the moon casts a shadow on a portion of the earth's surface
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What is an umbra?
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is the darkest part of the moons shadow
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What is a penumbra?
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a region of shadow, that is less dark than the umbra
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A lunar eclipse.......
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occurs when earth casts a shadow on the moon.
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What are tides?
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are the regular rise and fall of ocean waters.
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Tides are caused......
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mainly by differences in the moon's gravitational pull on the earth
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What is a spring tide?
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where the change between daily high and low tides is the greatest
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What phases of the moon result in a spring tide?
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full moon and new moon
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What is a neap tide?
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where there is the least amount of change between daily low and high tides.
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What phases of the moon result in a neap tide?
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third-quarter moon or first quarter moon
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