Question

When the medium between two bodies changed force of gravitational between them?

Answer 1

$\huge\tt\red{A}\tt\pink{N}\tt\blue{S}\tt\green{W}\tt\purple{E}\tt\orange{R}\tt\orange{:-}$

Gravitational waves are affected by a medium through a dispersion relation, but the effect is ridiculously small and is neglected. There are multiple forces involved in your thought experiment. ... This does not mean that the presence of the air affects the gravitational force.

Answer 2

$\huge\tt\red{A}\tt\pink{N}\tt\blue{S}\tt\green{W}\tt\purple{E}\tt\orange{R}\tt\orange{:-}$

Gravitational waves are affected by a medium through a dispersion relation, but the effect is ridiculously small and is neglected. There are multiple forces involved in your thought experiment. ... This does not mean that the presence of the air affects the gravitational force.