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With these animations, Earth science students can follow the 76-year orbit of Halley's Comet. The introduction describes the highly elliptical orbit of comets and states that comet Halley will return to the solar system in the year 2061. Students are instructed to choose between a wide-angle view of the comet's entire orbit and a view of the comet's path through the inner solar system. The wide-angle view shows how the comet's velocity increases as it approaches the sun and decreases as it travels into deep space. The inner solar system view depicts the comet as it crosses the orbits of Saturn and Jupiter. Movie controls allow students to repeat, pause, or step through the animation, which can give students more time to analyze the images. Copyright 2005 Eisenhower National Clearinghouse
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