Exam 10: Origin of the Solar System and Extrasolar Planets

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The most important source for determining the age of the Solar System is by sampling a planet's core.

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The process of _______________ depends partly on the presence of short-lived radioactive elements whose rapid decay would have released enough heat to melt the interior of planets.

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Explain the Jovian problem and some possible answers to why there are so many Jovian planets found around stars.

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What are the small bits of rock and metal that collide with Earth's atmosphere?

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Why do Terrestrial planets not have rings?

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Which hypothesis was out-ruled by the solar nebular theory?

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Explain the steps involved in clearing a nebular of its interstellar material that stopped planetary formation.

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Asteroids are the last of the icy planetesimals from the formation of the Solar System.

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The passing star hypothesis suggests that planets form in the rotating disks of gas and dust around young stars.

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The first extrasolar planets discovered are small and have long orbital periods.

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The inner planets are composed of ____.

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A collection of small, icy bodies are found in the _______________ orbiting in the outer fringes of our Solar System

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All the planets revolve around the Sun in a(n) _______________ direction.

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Terrestrial planets grew slowly and the Jovian planets grew quickly.

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Which theory best describes today's current thinking about the birth of a solar system?

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Explain the two sources of heat that "melted" a planet during its formation.

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Almost every solid surface in the Solar System is covered with _______________, most of which formed during a period of heavy bombardment.

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Jupiter and Saturn are so massive that they were able to grow by drawing in hot gas by gravitational contraction from the solar nebula.

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The _______________ of a radioactive substance is the time it takes for half of the parent isotope atoms to decay into daughter isotope atoms.

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Explain why the passing star hypothesis was problematic.

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