Additional Materials

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• 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

Web Links

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• 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