Ch. 17 Review Questions Astronomy OpenStax. WebReview Questions 1. What two factors determine how bright a star appears to be in the.
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Web1. How do we know the age of the Sun? 2. Explain how we know that the Sun’s energy is not supplied either by chemical burning, as in fires here on Earth, or by gravitational contraction (shrinking). 3. What is the ultimate source of energy that makes the Sun shine? 4. What are the formulas for the three steps in the proton-proton chain? 5.
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