Additional Materials
- Threshold 1: The Big Bang - Poster
- Cosmic Microwave Background (CMB) - Information Sheet
- In their Own Words - Excerpts from Thomas Kuhn's The Structure of Scientific Revolutions
- Henrietta Leavitt - Biography
- Tycho Brahe - Biography
- Science, Theology and the Copernican Revolution - Article
- The Vatican Observatory - Article
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Web Links
- Henrietta Leavitt & the Human Computers: Great Minds -SciShow
- Big Bang Briefly - Janna Levin
- What happened at 380,000 Years ABB? - Cameron Gibelyou
- The Expanding Universe - Tim McKay
- Stellar Parallax - Khan Academy
- Four Fundamental Forces - Khan Academy
- Why Gravity Gets so Strong Near Dense Objects - Khan Academy
- Introduction to Light - Khan Academy
- Introduction to the Doppler Effect - Khan Academy
- The Galileo Project
- Stephen Hawking's Universe - PBS Online
- NASA's Cosmic Origins Spectrograph - NASA
