| The Big Bang Theory | How gravity governs movement of planets, comets, and asteroids | How stars produce energy | How scientific knowledge and explanations have changed over time | Scientific knowledge and explanations have changed over time |
|---|---|---|---|---|
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What is the Big Bang Theory?
A theory of how the universe began.
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Why do the planets stay in orbit?
Gravity and inertia combine to keep the planets in orbit around the sun.
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What is a star's main source of fuel?
Hydrogen.
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According to the Big Bang Theory, how did the universe begin?
A cataclysmic explosion of a small volume of matter at extremely high density and temperature.
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How does a star produce energy?
The fusion of hydrogen nuclei into helium nuclei.
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What factors determine a star's life span?
Mass.
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