Dynamical friction
Gravitational loss of momentum and energy by bodies moving through surrounding matter / From Wikipedia, the free encyclopedia
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In astrophysics, dynamical friction or Chandrasekhar friction, sometimes called gravitational drag, is loss of momentum and kinetic energy of moving bodies through gravitational interactions with surrounding matter in space. It was first discussed in detail by Subrahmanyan Chandrasekhar in 1943.[1][2][3]
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For the resistance of relative motion between solids, see Dynamic friction.