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Astronomy Chapter 7: Mercury, Venus & Mars

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Both have lots of craters, No plate tectonics, and phases seen from earth.
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How are Mercury and the Moon similar?
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Mercury has a magnetic field, is larger and more dense and has a much larger core.
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How are mercury and the moon different?
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Because mercury is never more then 28 degrees away from the sun.
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Why is Mercury difficult to observe from Earth?
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Fracturing or faulting Mercury’s crust contracted
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What caused the scarps on Mercury? How did the scarps affect Mercury’s crust?
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At the poles in deep craters. The sun will never be directly on the poles and the craters will provide extra shading
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Where is the ice on Mercury located? How can Mercury have ice on it?
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Mercury and the sun strong tidal effects, slightly elongated shape, eccentric orbit
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What is the 3-2 spin orbit coupling for Mercury? What does this cause for Mercury?
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Similar in size,mass and composition Venus has no water or life, much thicker atmosphere, hottest planet
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How is Venus like the Earth? How is it different?
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when a planets rotation around its axis is the opposite of the direction of orbital motion. Venus and Uranus
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What is retrograde rotation? Which planets have this motion?
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Its goal was to measure Venus’s atmosphere. First unmanned spacecraft to reach the surface of another planet.
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Why did the Soviet spacecraft crash on Venus?
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Intense heat and volcanoes
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What geological feature created the atmosphere for Venus?
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The greenhouse effect
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Why is Venus hotter than it should be?
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1.Solar radiation passes through the clear atmosphere. 2.Most radiation is absorbed by the Earth’s surface and warms it 3.Some solar radiation is reflected by the Earth and the atmosphere. 4.Some of the infrared radiation passes through the atmosphere, and some is absorbed and re-emitted in all directions 5. Infrared radiation is emitted from the Earth’s surface
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Greenhouse effect steps
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Similar day length and axis tilt, experience seasons. Mars is covered with rust, much colder than earth, half the size of earth and has 2 moons
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How is mars like earth? how is it different?
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Channels Schiaparelli in 1877 Mars
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What are “canali”? Who is responsible for drawing the “canali”? Which planet had “canali”?
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Because It evidence of water
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Why did people believe that Mars could be habitable?
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dried up Channels left from rivers/streams and Ice caps Southern highlands
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What evidence do we have that water once flowed on Mars? Where do we find this evidence?
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catastrophic but rare flooding
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what produced the huge outflow channels on Mars?
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Because its covered in rust or iron oxide
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Why is Mars called the “Red Planet”?
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Mars and Earth have moons Venus and Mercury do not
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Which terrestrial planets have moons and which do not?
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Because they formed at different distance from the sun
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Why did Venus and Mars evolve differently than the Earth?
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Mercury-Messenger Venus- Venus Express Mars- Odyssey, Curiosity, Opportunity, MRO, MOM and MAVEN
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Name the current missions for Mercury, Venus, and Mars.