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In this activity students use pictures of Coronal Mass Ejection (CME) activity near the Sun, taken by the National Aeronautics and Space Administration/European Space Agency (NASA/ESA) Solar Heliospheric Observatory (SOHO) satellite, and calculate the speed of a CME. They discover that Coronal Mass Ejections are major storms on the Sun, which can hurl billions of tons of matter into space in a matter of a few hours. Traveling at millions of kilometers per hour, some of these clouds occasionally collide with the Earth and have produced power blackouts and satellite damage. Students view pictures in which they can see material being ejected from the Sun. They are given the elapsed time between frames, and the diameter of the sun, and are asked to select a feature in the expanding gas CME and measure its distance from the Sun from one frame to the next in order to calculate the speed of that feature. Students then plot the information and answer some questions about the speed of the CME.
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