Suppose that stars were born at random times over the last 10^10 years. The rate of star formation is simply the number of stars divided by 10^10 years. The fraction of stars with detected extrasolar planets is at least 13 %, so the rate of star formation can be multiplied to find the approximate rate of formation of planetary systems. How often (in years) does a planetary system form in our galaxy? Assume the Milky Way contains 6 × 10^11 stars. Ok, I have gotten all kinds of numbers. Milky Way at 6×10^11stars / 10^10 years = 60…is that 60 stars per year? I think so… Then what? Multiply 60 x 13/100 = 7.8 Stars per year with planetary systems…is that right? But then I need number of systems per year which is…do I divide 365.25 by 7.8 to get a fraction of a year? Please show steps and thank you!
Suppose that stars were born at random times over the last 10^10 years. The
rate of star formation is simply the number of stars divided by 10^10 years. The fraction of stars with detected extrasolar planets is at least 13 %, so the rate of star formation can be multiplied to find the approximate rate of formation of planetary systems. How often (in years) does a planetary system form in our galaxy? Assume the Milky Way contains 6 × 10^11 stars.
Ok, I have gotten all kinds of numbers. Milky Way at 6×10^11stars / 10^10 years = 60…is that 60 stars per year? I think so…
Then what? Multiply 60 x 13/100 = 7.8 Stars per year with planetary systems…is that right?
But then I need number of systems per year which is…do I divide 365.25 by 7.8 to get a fraction of a year?
Please show steps and thank you!
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