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Unformatted text preview: Astronomy 1400 Review for Test 3 4/20/2009 02:01:00 AM Chapter 7 What planets have we sent spacecrafts to? Orbiters? Landers? To date, we have sent robotic spacecraft to all the terrestrial and jovian planets, as well as many to the moons, asteroids, and comets. Orbiters We have sent orbiters to the moon, and to the planets Venus, Mars, Jupiter, and Saturn, and two asteroids. Landers Mars and the moon. We have returned samples from what? We have only returned samples from the moon. What are some major current missions? Mercury: Messenger orbiter will study surface, atmosphere, and interior. Asteroids: Hayabusa orbited and landed on asteroid Itokawa ; may return a sample in 2010. Dawn will visit the large asteroid Vesta and the dwarf planet Ceres . Which planets have we sent spacecraft to? Which celestial bodies have we returned samples from? Landed on? Orbited? Flown by? What was the first spacecraft launched? When and by whom? Where do we find asteroids and comets? Most asteroids are found within the asteroid belt between the orbits of Mars and Jupiter. Comets orbit the sun in the same direction and nearly the same plane as the planets, occupying a broad region beyond the orbit of Neptune that we call the Kuiper Belt . What are asteroids and comets made of? Asteroids: made up of rocks Comets: they are made largely of ices (such as water ice, ammonia ice, and methane ice) mixed with rock. Know the location and characteristics of the Kuiper belt comets and the Oort cloud. Connor Scribner 07/04/2009 22:09:00 Chapter 8 What is the nebular theory? What observational evidence is there for it? Why was it important that the initial nebula was rotating? As the nebula falls inward and its radius decreases, explain what happens in terms of conservation of energy and momentum? Why does the nebula heat up as it collapses? How does the nebular theory account for the patterns of motion that we see in the solar system? How does the nebular theory deal with exceptions? The first 100 million years of the solar systems development is called the period of ______. Why? What is the most likely scenario for the formation of the Moon? Why are their two types of planets according to the nebular theory? What is the most important physical parameter in determining how a planet will turn out, i.e., a terrestrial or a Jovian? What and where is the frost line?...
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- Spring '10