1. If a human generation, the average time from birth to childbearing, has been 20 years long,… 1 answer below »

1. If a human generation, the average time from birth to childbearing, has been 20 years long, how many generations have passed in the last 1 million years? 2. If there are about 1.4 × 10-4 stars like the sun per cubic light-year, how many lie within 100 light-years of Earth? (Hint: The volume of a sphere  

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