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1 more physics question?
You are observing a planet orbiting a distant star. You measure the radius of orbit to be around 1.5 AU (1 astronomical unit = the distance from the earth to the sun) and that the planet is in the same position in the sky every 23 days.
1. What is the mass of the star?
2. Express your answer in units of earth masses.
I know that the first step is to find the orbit velocity of the planet. I'm just having a hard time trying to figure that out.
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