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Cosmology and Astronomy: Radius of Observable Universe
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CC BY-NC-SA
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This 17-minute video lesson discusses the radius of the observable universe. [Cosmology and Astronomy playlist: Lesson 8 of 85]

Subject:
Physical Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Khan, Salman
Date Added:
02/20/2011
Cosmology and Astronomy: Refraction of Seismic Waves
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CC BY-NC-SA
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This 9-minute video lesson looks at refraction and focuses on refraction in seismic waves. [Cosmology and Astronomy playlist: Lesson 53 of 85]

Subject:
Earth Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Khan, Salman
Date Added:
02/20/2011
Cosmology and Astronomy: Scale of Distance to Closest Stars
Conditional Remix & Share Permitted
CC BY-NC-SA
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This 8-minute video lesson examines the scale of distance from the solar system to the closest stars. [Cosmology and Astronomy playlist: Lesson 3 of 85]

Subject:
Physical Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Khan, Salman
Date Added:
02/20/2011
Cosmology and Astronomy: Scale of the Large
Conditional Remix & Share Permitted
CC BY-NC-SA
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This 11-minute video lesson attempts to comprehend the size of the universe and the scale of the large. [Cosmology and Astronomy playlist: Lesson 57 of 85]

Subject:
Earth Science
Physical Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Salman Khan
Date Added:
02/20/2011
Cosmology and Astronomy: Scale of the Small
Conditional Remix & Share Permitted
CC BY-NC-SA
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This 13-minute video lesson attempts to comprehend the scale of the small: from honey bees, to cells, to viruses, to atoms. [Cosmology and Astronomy playlist: Lesson 58 of 85]

Subject:
Physical Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Salman Khan
Date Added:
02/20/2011
Cosmology and Astronomy: Seasons Aren't Dictated by Closeness to Sun
Conditional Remix & Share Permitted
CC BY-NC-SA
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This 5-minute video lesson looks at seasons and why they aren't dictated by the Earth's closeness to the sun. [Cosmology and Astronomy playlist: Lesson 69 of 85]

Subject:
Physical Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Khan, Salman
Date Added:
02/20/2011
Cosmology and Astronomy: Seismic Waves
Conditional Remix & Share Permitted
CC BY-NC-SA
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This 9-minute video lesson considers seismic waves and how they are related to the composition of the Earth. It covers both S-waves and P-waves. [Cosmology and Astronomy playlist: Lesson 51 of 85]

Subject:
Earth Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Khan, Salman
Date Added:
02/20/2011
Cosmology and Astronomy: Stellar Distance Using Parallax
Conditional Remix & Share Permitted
CC BY-NC-SA
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This 12-minute video lesson looks at how to measure stellar distance using parallax. [Cosmology and Astronomy playlist: Lesson 23 of 85]

Subject:
Physical Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Khan, Salman
Date Added:
02/20/2011
Cosmology and Astronomy: Stellar Parallax Clarification
Conditional Remix & Share Permitted
CC BY-NC-SA
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This 2-minute video lesson provides clarification on parallax. [Cosmology and Astronomy playlist: Lesson 24 of 85]

Subject:
Physical Science
Science
Material Type:
Activity/Lab
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Khan, Salman
Date Added:
02/20/2011