1. The problem statement, all variables and given/known data The binary star system Krell consists of two stars, Krell A and Krell B, orbiting each other, with no other ojects nearby. Assume Krell A, the smaller star of mass mA, moves in a circle of radius rA at speed vA. Krell B, the larger star of mass mB = 2.51mA), moves in a circle of radius rB at speed vB. The two stars are separated by a distance d. Find the ratio of the periods of orbit TA/TB 2. Relevant equations I would assume these formulas: →T²/r³ →T²/r³ = 4π²/(G(M + m)) 3. The attempt at a solution I believe the approach is... T_A²/R_A³ = T_B²/R_B³ T_A²/T_B² = R_A³/R_B³ (T_A/T_B) = √((R_A/R_B)³) From the previous part of the problem, I've found that R_A/R_B = 2.51. Then, I substitute that for the above expression and got the answer incorrect. T_A/T_B = √(2.51³) ≈ 3.98 But the answer is incorrect.