1. Why does a star’s life expectancy depend on its mass? 2. How Do We Know? Why are scientists…

1. Why does a star’s life expectancy depend on its mass? 2. How Do We Know? Why are scientists free to adjust their hypotheses but not their facts? 3. How Do We Know? How can mathematical models help you understand natural processes that occur in locations or with time scales that make them impossible to observe directly?  

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