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Does anyone know an equation I could use to calculate the radius of Earth's orbit (assuming a spherical orbit) around the sun if the sun were to decrease in mass? So far every equation I've used gives me a lower orbital radius since I'm keeping either orbital velocity or orbital period constant. I know I need to change the values of either the velocity or period but I'm not sure how. Does anyone have any ideas?
This is not graduate-level, voting to close. 500+ rep users can upvote the closevote here.
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