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10 Cards in this Set
- Front
- Back
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Terrestrial Planets |
Mercury, Venus, Earth, Mars -close to the sun, closely spaced -small radius and mass -rock and metal -solid surface -high density -slower rotation, weak magnetic field -few moons, no rings |
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Terrestrial planets as seen from earth |
when viewed by the unaided eye, all planets are just dots (mars is reddish) |
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Mecury and venus |
always seen close to the sun venus- morning star or evening star |
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with a telescope |
mercury and venus show phases. every 2 years we get good views of mars when we pass it on our inside orbit |
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Mercury |
1/3 Earth's diameter(4800 km) and gravity distance from sun 0.4 AU Density- similar to earth's surface- impact craters, maria; no surface activity no atmosphere temperature- hot days, cold nights. no weather. 3:2 spin-orbit resonance |
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Mercury surface features |
dominant impact craters show old surface, with little activity Maria- smooth, dark uncratered basins |
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caloris basin and weird terrain |
1300km, 800 mile Mercury's largest impact site directly opposite the caloris basin there is a jumbled and broken surface called the weird terrain. |
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Formation of caloris basin and weird terrain |
the impact that created caloris basin sent seismic waves through Mercury, which intersected on the far side, creating the weird terrain |
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Kelvin temperature scale |
used by astronomers instead of celsius or fahrenheit. absolute zero is the lowest possible temp. = zero kelvin= 0 k |
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Human body and earth |
300 k |
