This 2-minute video lesson provides a correction to the previous video about quasars. [Cosmology and Astronomy playlist: Lesson 36 of 85]

This 9-minute video lesson discusses quasars. [Cosmology and Astronomy playlist: Lesson 35 of 85]

This 17-minute video lesson discusses the radius of the observable universe. [Cosmology and Astronomy playlist: Lesson 8 of 85]

This 10-minute video discusses redshift and the Doppler Effect. [Cosmology and Astronomy playlist: Lesson 10 of 85]

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]

This 10-minute video lesson looks at the scale of the Earth and the Sun. [Cosmology and Astronomy playlist: Lesson 1 of 85]

This 13-minute video lesson examines the size and scale of the solar system. [Cosmology and Astronomy playlist: Lesson 2 of 85]

This 13-minute video lesson examines the scale of our galaxy. [Cosmology and Astronomy playlist: Lesson 4 of 85]

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]

This 7-minute video lesson looks at images of star fields and nebulas. [Cosmology and Astronomy playlist: Lesson 20 of 85]

This 12-minute video lesson looks at how to measure stellar distance using parallax. [Cosmology and Astronomy playlist: Lesson 23 of 85]

This 9-minute video lesson provides another introduction to stellar parallax. [Cosmology and Astronomy playlist: Lesson 22 of 85]

This 2-minute video lesson provides clarification on parallax. [Cosmology and Astronomy playlist: Lesson 24 of 85]

This 9-minute video lesson looks at supermassive black holes. [Cosmology and Astronomy playlist: Lesson 34 of 85]

This 2-minute video lesson provides a clarification about supernovae. [Cosmology and Astronomy playlist: Lesson 29 of 85]

This 12-minute video lesson looks at supernovae. [Cosmology and Astronomy playlist: Lesson 28 of 85]

This 2-minute video lesson looks at the causes precession and other orbital changes. [Cosmology and Astronomy playlist: Lesson 74 of 85]

This 13-minute video lesson looks at the process of stars becoming white and black dwarfs. [Cosmology and Astronomy playlist: Lesson 18 of 85]

This 7-minute video lesson explains why cepheids pulsate. [Cosmology and Astronomy playlist: Lesson 32 of 85]

This 8-minute video lesson looks at why gravity gets so strong near dense objects. [Cosmology and Astronomy playlist: Lesson 33 of 85]