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Instructional Video
Khan Academy: Big Bang and Expansion of the Universe:cosmic Background Radiation Instructional Video
Khan Academy

Khan Academy: Big Bang and Expansion of the Universe:cosmic Background Radiation

9th - 10th
Video lecture explains cosmic background radiation and redshift. [10:16]
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Instructional Video
Khan Academy: Big Bang: Radius of Observable Universe Instructional Video
Khan Academy

Khan Academy: Big Bang: Radius of Observable Universe

9th - 10th
Video lecture explores radius of observable universe. [16:39]
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