Equation Icon  c5 5a4 5c5(P ∕2 π)8∕3 ( P )8∕3( ℳ ) −5∕3 t0 = --------0---= -------0-------≈ (9.8 × 106 yr) --0- ---- . (26 ) G3 256M 2μ 256 (G ℳ )5∕3 1 h M ⊙