M₁ = mass of planet #1 M₂ = mass of planet #2 M = total mass R₁ = radius of planet #1 R₂ = radius of planet #2 d₁ = initial distance between planet centers d₂ = final distance between planet centers a = semimajor axis of plunge orbit v₁ = relative speed of approach at distance d₁ v₂ = relative speed of approach at distance d₂
M₁ = M₂ = 1.8986e27 kilograms M = M₁ + M₂ = 3.7972e27 kg G = 6.6742e-11 m³ kg⁻¹ sec⁻² GM = 2.5343e17 m³ sec⁻² d₁ = 1.4e11 meters a = d₁/2 = 7e10 meters R₁ = R₂ = 7.1492e7 meters d₂ = R₁ + R₂ = 1.42984e8 meters v₁ = 0 v₂ = √[GM(2/d₂−1/a)] <span> v₂ = 59508.4 m/s </span> <span> The time to fall is 1337.7 days
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