I read Larry Niven's Ringworld series decades ago when I was a physics major. It was actually a "ribbon" around the star, due to the problems you raise, Ella, with a sphere. What a playground for a novelist!

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Pierre Whalon

Bishop in charge, Convocation of Episcopal Churches in Europe, 2001–2019. French-American. Musician, composer, author, happily married. www.pierrewhalon.info