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2. The Big Bang

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How Did Our View of the Universe Change?Claudius PtolemyNicolaus CopernicusGalileo Galilei Isaac NewtonEdwin HubbleGallery: How Did Our Understanding of the Universe Change?
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Activity: Big Bang Snap JudgmentWhat Emerged from the Big Bang?Threshold 1: The Big BangThreshold Card: Threshold 1 The Big BangActivity: This Threshold TodayQuestions About the Big Bang
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Activity: Claim Testing Snap JudgmentApproaches to KnowledgeHow Do We Decide What to Believe?Claim Testers: Episode 1 – First ContactActivity: Claim Testing: The Big Bang
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Glossary: The Big Bang
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The Structure of Scientific RevolutionsHenrietta LeavittTycho BraheScience, Theology, and the Copernican RevolutionThe Vatican ObservatoryWeb Links
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Guide, Slides, and Text ReaderVideo Transcripts

About this unit

Big History will introduce you to many new ideas and claims. You won’t simply accept these claims as facts and move on. You’ll be encouraged to test them. You’ll learn how to evaluate information presented to you, and be encouraged to decide for yourself what to believe and what to investigate further. This is how our thinking advances. Today’s scientific view of the history of the Universe is based on the work of thousands of scientists and scholars over thousands of years. People built upon each other’s work. New technology and new observations have led to ever sharper theories about the Universe and its beginnings. As you study how these views have evolved, you’ll develop your own skills for testing the claims of others and making claims of your own.