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12 Cards in this Set
- Front
- Back
- 3rd side (hint)
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1st method to determine distance to moon |
If you know the true size of and object and its apparent (angular size) you can determine its distance |
Relation between angle distance size |
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2nd method |
The slight shift in the moons position when viewed from opposite sides of the earth |
Triangulation aka geocentric parallax. Viewing from different sides of the earth |
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3rd method |
Radar signals are bounced off the object and the time to return us accurately measured to within one billionth of a second |
Light and radio signals travel at a speed if 186,000miles a second distances to objects that are closed enough can be measured to within 1 ft |
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Diameter |
Moon about 2,000 miles. Earth 7,915 miles |
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Distance to the moon |
120 x 2,000= 24,000 miles |
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Density |
Earth 5.5 gm/cc. Moon 3.3 gm/cc |
Mass/distance |
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Finding internal structure |
The only viable way is through the study of the waves generated by earthquakes |
Seismology |
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Moho |
Boundary between the earth's crust and the mantle. Bottom of the crust |
Mohorovicic some seismic waves suddenly changed speed and were reflected |
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Maria |
The most prominent features on the side of the moon that's facing us are the dark patches |
Season by Galileo cuz their flatness gave the appearance of dry lake beds. Not found on the other side of the moon |
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Plate tectonics |
Holds the entire earth's crust both continental and oceanic is divided into about a dozen gigantic plates that slip and slide over each other at extremely slow speeds producing almost all the earth's geologic activity |
Earthquakes and volcanic eruptions |
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Pangaea |
The continents were once joined together in a vast super continent |
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Layers of the earth and moon |
Crust mantle liquid iron solid iron core |
Outermost to innermost |
