因为(r1)^3/(T1)^2=k=(r2)^3/(T2)^2所以(r1)^3/(27)^2=(r2)^3/1^2所以(r1)^3/(r2)^3=729:1所以(r1)/(r2)=9:1Do you understand it?
根据开普勒第三定律，r^3/t^2=常数k,所以他们的轨道半径之比为9:1
