d^2r/dt^2 = -1e30*6.674e-11*r^(-2), r'(0) = 0, r(0) = 9.461e15, t = 31557600d^2r/dt^2 = -1e30*6.674e-11*r^(-2), r'(0) = 0, r(0) = 9.461e15, t = 31557600

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