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Distance Between Stars

Explains how parallax is used to measure distances to objects a few hundred light years from Earth, but brightness is used for objects at greater distances.

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Astrophysics - HR Diagram

Astrophysics - HR Diagram

A description of a Hertzsprung-Russell diagram, the information it contains, and how to read it.

http://youtu.be/tt6d9_PQ7TE

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