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Question sets and answer keys to accompany Cosmos: A Personal Voyage Episode X, The Edge of Forever, which emphasizes astronomy: the Big Bang theory and the curve of space. The question sets work with streaming and DVD versions of the episode. There was a nice article in November, 2017 issue of WIRED magazine titled "Twenty Years After His Death, Carl Sagan Is Still Right".
Lessons of Phyz advantages:
The zipped folder contains PDFs of student sheets and the answer keys.
For a preview, see the Cosmos: A Personal Voyage BUNDLE product description.