According to astrophysics, dynamical friction or Chandrashekhar friction or gravitational drag is defined as the loss of momentum and kinetic energy of any moving body through gravitational interactions with matter present in space. The effect of gravity causes the lighter bodies to accelerate and gain momentum much similar to how a slingshot works but by the laws of conservation of energy and momentum the heavier celestial body will be slowed down by the exact same amount to compensate the change in momentum. Considering the extreme difference in size between the two bodies this loss of momentum is negligible to the giant celestial mass. The greater the density of the surrounding mass, the stronger the force from dynamical friction. Dynamical friction is particularly important in the formation of planetary systems and interactions between galaxies. This effect was first discussed in detail by Subrahmanyan Chandrashekhar in 1943.

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